Video: Editing: The process of editing footage that can only be accessed or played in the sequence recorded. Tape is linear in that it has to be spooled for access to any material and can only play pictures in the order they are recorded. 

Linear (keying): Selective overlaying of one video signal over another.


Pank, B., Editor, 1994, The Digital Fact Book, 7th Ed, Quantel, Newbury, UK