n. something a little different from others of the same type; "an experimental version of the night fighter"; "a variant of the same word"; "an emery wheel is the modern variation of a grindstone"; "the boy is a younger edition of his father"

n. a mental representation of the meaning or significance of something

n. a written communication in a second language having the same meaning as the written communication in a first language

n. a written work (as a novel) that has been recast in a new form; "the play is an adaptation of a short novel"

n. manual turning of a fetus in the uterus (usually to aid delivery)

n. software containing corrections of a previous version