An object placed against or under another, to support it; anything that supports. / (rugby) The player on either side of the hooker in a scrum. / One of the seashells in the game of props.

(transitive, sometimes figuratively) To support or shore up something. / (intransitive) To play rugby in the prop position.

(theater, film) An item placed on a stage or set to create a scene or scenario in which actors perform. / An item placed within an advertisement in order to suggest a style of living etc.

The propeller of an aircraft.

To manually start the engine of a propeller-driven aircraft with no electric starter by pulling vigorously on one of the propeller blades using the hands, so that the propeller can catch ignition.

A proposition, especially on an election-day ballot.

(astronautics) propellant (“rocket fuel”)

(gambling, informal) Short for proposition player.

(organic chemistry) Denoting the presence of 3 carbon atoms in the parent chain when forming names of organic compounds.

(law) Abbreviation of property. / Alternative form of prop.