keyframe

noun

1. A single frame in an animation sequence drawn by an artist, between which others are tweened.

   “Lightning is a very quick and simple animation technique that can easily be overanimated. Don't try and animate the lightning bolt into the frame by building it up over a sequence of keyframes.”

2. A complete video frame, used as a reference for subsequent interframes in video compression.

verb

1. To animate by interpolation between successive keyframes.