Definition of "deadline" in English

noun

1. A time limit in the form of a date on or before which something must be completed.

   • I must make this deadline or my boss will kill me!

2. (archaic) A guideline marked on a plate for a printing press.

3. (archaic) A line that does not move.

4. (archaic) A boundary around a prison, prisoners crossing which would be shot.

verb

1. (military) To render an item non-mission-capable; to ground an aircraft, etc.