Definition of "keyframe"

keyframe

noun
plural keyframes
1. A single frame in an animation sequence drawn by an artist, between which others are tweened.
  Quotations
  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.
  2013, Chris Georgenes, How to Cheat in Adobe Flash CS6: The Art of Design and Animation
2. (computer graphics) A complete video frame, used as a reference for subsequent interframes in video compression.
verb
third-person singular simple present keyframes, present participle keyframing, simple past and past participle keyframed
1. To animate by interpolation between successive keyframes.