programming One of a sequence of copies of a program, each

incorporating new modifications. Each version is usually

identified by a number, commonly of the form X.Y where X is

the major version number and Y is the release number.

Typically an increment in X (with Y reset to zero) signifies a

substantial increase in the function of the program or a

partial or total re-implementation, whereas Y increases each

time the progam is changed in any way and re-released.