release

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release

1. Law the surrender of a claim, right, title, etc., in favour of someone else
2. a control mechanism for starting or stopping an engine
3. 
a. the opening of the exhaust valve of a steam engine near the end of the piston stroke
b. the moment at which this valve opens
4. the electronic control regulating how long a note sounds after a synthesizer key has been released
5. the control mechanism for the shutter in a camera

release

[ri′lēs]
(mechanical engineering)
A mechanical arrangment of parts for holding or freeing a device or mechanism as required.

release

i. The release of fuel tanks or any object from an aircraft.
ii. In air armament, the intentional separation of a free-fall aircraft store from its suspension equipment.

release

(programming)
(Or "released version", "baseline") A version of a piece of software which has been made public (as opposed to a version that is in development, or otherwise unreleased).

A release is either a major release, a revision, or a bugfix.

Pre-release versions may be called alpha test, or beta test versions.

See change management.