diff --git a/aio/content/guide/glossary.md b/aio/content/guide/glossary.md
index 094b52a110..292b0541f0 100644
--- a/aio/content/guide/glossary.md
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## Ahead-of-time (AOT) compilation
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You can compile Angular applications at build time.
By compiling your application using the compiler-cli, `ngc`, you can bootstrap directly
to a module factory, meaning you don't need to include the Angular compiler in your JavaScript bundle.
Ahead-of-time compiled applications also benefit from decreased load time and increased performance.
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## Angular module
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Helps you organize an application into cohesive blocks of functionality.
An Angular module identifies the components, directives, and pipes that the application uses along with the list of external Angular modules that the application needs, such as `FormsModule`.
@@ -48,23 +36,11 @@ called `AppModule` and resides in a file named `app.module.ts`.
For details and examples, see the [Angular Modules (NgModule)](guide/ngmodule) page.
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## Annotation
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In practice, a synonym for [Decoration](guide/glossary#decorator).
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{@a attribute-directive}
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## Attribute directives
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A category of [directive](guide/glossary#directive) that can listen to and modify the behavior of
other HTML elements, attributes, properties, and components. They are usually represented
as HTML attributes, hence the name.
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Learn about them in the [_Attribute Directives_](guide/attribute-directives) guide.
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{@a B}
## Barrel
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A way to *roll up exports* from several ES2015 modules into a single convenient ES2015 module.
The barrel itself is an ES2015 module file that re-exports *selected* exports of other ES2015 modules.
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## Binding
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Usually refers to [data binding](guide/glossary#data-binding) and the act of
binding an HTML object property to a data object property.
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between a "token"—also referred to as a "key"—and a dependency [provider](guide/glossary#provider).
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## Bootstrap
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You launch an Angular application by "bootstrapping" it using the application root Angular module (`AppModule`).
Bootstrapping identifies an application's top level "root" [component](guide/glossary#component),
which is the first component that is loaded for the application.
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You can bootstrap multiple apps in the same `index.html`, each app with its own top-level root.
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{@a C}
## camelCase
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The practice of writing compound words or phrases such that each word or abbreviation begins with a capital letter
_except the first letter, which is lowercase_.
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In Angular documentation, "camelCase" always means *lower camel case*.
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{@a component}
## Component
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An Angular class responsible for exposing data to a [view](guide/glossary#view) and handling most of the view’s display and user-interaction logic.
The *component* is one of the most important building blocks in the Angular system.
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the component in the role of "controller" or "view model".
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{@a D}
## dash-case
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The practice of writing compound words or phrases such that each word is separated by a dash or hyphen (`-`).
This form is also known as kebab-case.
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spelled in dash-case.
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## Data binding
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Applications display data values to a user and respond to user
actions (such as clicks, touches, and keystrokes).
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* [Two-way data binding with ngModel](guide/template-syntax#ngModel).
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{@a decorator}
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## Decorator | decoration
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A *function* that adds metadata to a class, its members (properties, methods) and function arguments.
Decorators are an experimental (stage 2), JavaScript language [feature](https://github.com/wycats/javascript-decorators). TypeScript adds support for decorators.
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## Dependency injection
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A design pattern and mechanism
for creating and delivering parts of an application to other
parts of an application that request them.
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Read more in the [Dependency Injection](guide/dependency-injection) page.
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{@a directive}
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## Directive
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An Angular class responsible for creating, reshaping, and interacting with HTML elements
in the browser DOM. The directive is Angular's most fundamental feature.
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elements and their children.
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{@a E}
## ECMAScript
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The [official JavaScript language specification](https://en.wikipedia.org/wiki/ECMAScript).
The latest approved version of JavaScript is
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Angular developers can write in ES5 directly.
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## ES2015
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Short hand for [ECMAScript](guide/glossary#ecmascript) 2015.
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## ES5
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Short hand for [ECMAScript](guide/glossary#ecmascript) 5, the version of JavaScript run by most modern browsers.
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## ES6
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Short hand for [ECMAScript](guide/glossary#ecmascript) 2015.
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{@a F}
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## Injector
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An object in the Angular [dependency-injection system](guide/glossary#dependency-injection)
that can find a named dependency in its cache or create a dependency
with a registered [provider](guide/glossary#provider).
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## Input
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A directive property that can be the *target* of a
[property binding](guide/template-syntax#property-binding) (explained in detail in the [Template Syntax](guide/template-syntax) page).
Data values flow *into* this property from the data source identified
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See the [Input and output properties](guide/template-syntax#inputs-outputs) section of the [Template Syntax](guide/template-syntax) page.
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## Interpolation
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A form of [property data binding](guide/glossary#data-binding) in which a
[template expression](guide/glossary#template-expression) between double-curly braces
renders as text. That text may be concatenated with neighboring text
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[Template Syntax](guide/template-syntax) page.
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{@a J}
{@a jit}
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## Just-in-time (JIT) compilation
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A bootstrapping method of compiling components and modules in the browser
and launching the application dynamically. Just-in-time mode is a good choice during development.
Consider using the [ahead-of-time](guide/glossary#aot) mode for production apps.
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{@a K}
## kebab-case
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See [dash-case](guide/glossary#dash-case).
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{@a L}
## Lifecycle hooks
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[Directives](guide/glossary#directive) and [components](guide/glossary#component) have a lifecycle
managed by Angular as it creates, updates, and destroys them.
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Read more in the [Lifecycle Hooks](guide/lifecycle-hooks) page.
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{@a M}
## Module
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Angular has the following types of modules:
* [Angular modules](guide/glossary#angular-module).
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You rarely access Angular feature modules directly. You usually import them from an Angular [scoped package](guide/glossary#scoped-package) such as `@angular/core`.
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## Observable
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An array whose items arrive asynchronously over time.
Observables help you manage asynchronous data, such as data coming from a backend service.
Observables are used within Angular itself, including Angular's event system and its HTTP client service.
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Observables are a proposed feature for ES2016, the next version of JavaScript.
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## Output
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A directive property that can be the *target* of event binding
(read more in the [event binding](guide/template-syntax#event-binding)
section of the [Template Syntax](guide/template-syntax) page).
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See the [Input and output properties](guide/template-syntax#inputs-outputs) section of the [Template Syntax](guide/template-syntax) page.
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## PascalCase
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The practice of writing individual words, compound words, or phrases such that each word or abbreviation begins with a capital letter.
Class names are typically spelled in PascalCase. For example, `Person` and `HeroDetailComponent`.
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In this documentation, "PascalCase" means *upper camel case* and "camelCase" means *lower camel case*.
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## Pipe
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An Angular pipe is a function that transforms input values to output values for
display in a [view](guide/glossary#view).
Here's an example that uses the built-in `currency` pipe to display
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Read more in the page on [pipes](guide/pipes).
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## Provider
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A _provider_ creates a new instance of a dependency for the
[dependency injection](guide/glossary#dependency-injection) system.
It relates a lookup token to code—sometimes called a "recipe"—that can create a dependency value.
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{@a Q}
{@a R}
## Reactive forms
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A technique for building Angular forms through code in a component.
The alternative technique is [template-driven forms](guide/glossary#template-driven-forms).
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Reactive forms are powerful, flexible, and a good choice for more complex data-entry form scenarios, such as dynamic generation of form controls.
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## Router
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Most applications consist of many screens or [views](guide/glossary#view).
The user navigates among them by clicking links and buttons,
and performing other similar actions that cause the application to
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For more information, see the [Routing & Navigation](guide/router) page.
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## Router module
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A separate [Angular module](guide/glossary#angular-module) that provides the necessary service providers and directives for navigating through application views.
For more information, see the [Routing & Navigation](guide/router) page.
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## Routing component
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An Angular [component](guide/glossary#component) with a `RouterOutlet` that displays views based on router navigations.
For more information, see the [Routing & Navigation](guide/router) page.
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## Scoped package
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A way to group related *npm* packages.
Read more at the [npm-scope](https://docs.npmjs.com/misc/scope) page.
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## Service
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For data or logic that is not associated
with a specific view or that you want to share across components, build services.
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For more information, see the [Services](tutorial/toh-pt4) page of the [Tour of Heroes](tutorial) tutorial.
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## snake_case
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The practice of writing compound words or phrases such that an
underscore (`_`) separates one word from the next. This form is also known as *underscore case*.
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{@a structural-directive}
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## Structural directives
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A category of [directive](guide/glossary#directive) that can
shape or reshape HTML layout, typically by adding and removing elements in the DOM.
The `ngIf` "conditional element" directive and the `ngFor` "repeater" directive are well-known examples.
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Read more in the [Structural Directives](guide/structural-directives) page.
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## Template
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A chunk of HTML that Angular uses to render a [view](guide/glossary#view) with
the support and guidance of an Angular [directive](guide/glossary#directive),
most notably a [component](guide/glossary#component).
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## Template-driven forms
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A technique for building Angular forms using HTML forms and input elements in the view.
The alternate technique is [Reactive Forms](guide/glossary#reactive-forms).
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in the [Forms](guide/forms) page.
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## Template expression
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A TypeScript-like syntax that Angular evaluates within
a [data binding](guide/glossary#data-binding).
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of the [Template Syntax](guide/template-syntax) page.
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## Transpile
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The process of transforming code written in one form of JavaScript
(such as TypeScript) into another form of JavaScript (such as [ES5](guide/glossary#es5)).
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## TypeScript
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A version of JavaScript that supports most [ECMAScript 2015](guide/glossary#es2015)
language features such as [decorators](guide/glossary#decorator).
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Read more about TypeScript at [typescriptlang.org](http://www.typescriptlang.org/).
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## View
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A portion of the screen that displays information and responds
to user actions such as clicks, mouse moves, and keystrokes.
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under the control of a [router](guide/glossary#router).
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## Zone
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A mechanism for encapsulating and intercepting
a JavaScript application's asynchronous activity.
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the information it displays via [data bindings](guide/glossary#data-binding).
Learn more about zones in this
-[Brian Ford video](https://www.youtube.com/watch?v=3IqtmUscE_U).
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+[Brian Ford video](https://www.youtube.com/watch?v=3IqtmUscE_U).
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