| A | B |
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| 3D space | A three-dimensional effect created by including the z axis as a property of a movie clip instance as well as its x and y axes. |
| armature | a chain of bones. |
| Bezier handles | handles used to modify the curve of the path around a control point by dragging or extending the endpoints of the handles. |
| bone | A structure used to connect symbol instances or interior parts of a shape so that moving one bone, moves the other bones relative to the bone that initiated the movement; used to more easily create natural movements. |
| child movie clip | a nested movie clip instance. |
| control point | a place on a motion path where a change was made to the path or to the target object. |
| easing | how fast or slow an object moves throughout an animation, which can make the animation appear more natural. |
| inverse kinematics | an animation method where an object or a set of objects is animated in relation to each other using bone structures. |
| mask layer | a layer that contains a graphic element that hides the content of the masked layer. |
| masked layer | the layer below the mask layer; the contents of the masked layer are hidden except for the area covered by the element on the mask layer. |
| Motion Editor | a panel that displays all properties and property keyframes for the selected motion tween to provide precise control of the target object’s coordinates, rotation, and transformation properties at each property keyframe. |
| motion path | a line that guides an object throughout the animation. |
| Movie Explorer | a panel that displays a hierarchical view of all the elements in a document, making it simpler to manage and locate individual elements; used to view each of the document’s elements, search for a specific element, find all instances of a particular symbol, or print a list of the document’s elements as listed in the Movie Explorer. |
| nested symbol | a symbol that contains instances of other symbols within its Timeline. |
| onion skinning | the display of more than one frame at a time on the Stage; the content of the current frame, indicated by the position of the playhead, appears in full color and the contents of the frames before and after the current frame appear dimmed. |
| parent movie clip | the movie clip in which a child movie clip is nested. |
| pose layer | the layer in which a symbol instance or shape and its armature are moved when bones are added to a symbol instance or shape. |
