Definition of "keyframe" []

• A single frame in an animation sequence drawn by an artist, between which others are tweened (noun)
• A complete video frame, used as a reference for subsequent interframes in video compression (noun)
• To animate by interpolation between successive keyframes. (verb)

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• "The diamond icons -- the universal symbol for "keyframe" -- actually just allow you to change the opacity/volume of the individual clips by clicking and dragging, which I personally found confusing but by which more novice users may be less perplexed."
• "Modern video streams save bandwidth by only sending frame-to-frame changes, and transmitting a full picture — known as a keyframe — only occasionally."
• "A keyframe is a complete frame and the ones following and proceeding are just partial frames."