.toggleClass()

Add or remove one or more classes from each element in the set of matched elements, depending on either the class’s presence or the value of the switch argument, while animating all style changes.

Widget Plugin Bridge

Part of the jQuery Widget Factory is the jQuery.widget.bridge() method. This acts as the middleman between the object created by $.widget() and the jQuery API.

CSS Framework

A list of the class names used by jQuery UI to allow components to be themeable.

Easings

Easing functions specify the speed at which an animation progresses at different points within the animation.