late 14c., "appointment," from O.Fr. assignment, from L.L. assignamentum, noun of action from assignare (see assign). Meaning "a task assigned" (to someone) is from c.1848.
programming Storing the value of an expression in a variable. This is commonly written in the form "v = e". In Algol the assignment operator was ":=" (pronounced "becomes") to avoid mathematicians qualms about writing statements like x = x+1. Assignment is not allowed in functional languages, where an identifier always has the same value. See also referential transparency, single assignment, zero assignment. (1996-08-19)