Re‐lease″, n. 1. (Mach.) A device adapted to hold or release a device or mechanism as required; specif.: (Elec.) A catch on a motor-starting rheostat, which automatically releases the rheostat arm and so stops the motor in case of a break in the field circuit; also, the catch on an electromagnetic circuit breaker for a motor, which acts in case of an overload.
2. (Phon.) The act or manner of ending a sound.
3. (Railroads) In the block-signaling system, a printed card conveying information and instructions to be used at intermediate sidings without telegraphic stations.