As an even more surprising example of this, "alright" isn't even a real word. Tweening actually goes back to traditional animation where the keyframes (another

As an even more surprising example of this, "alright" isn't even a real word. Tweening actually goes back to traditional animation where the keyframes (another borrowed term) were hand-drawn by senior artists and the frames in between were added by junior artists. This process was called inbetweening, or tweening for short.