Any alteration or change.

(genetics) Any heritable change of the base-pair sequence of genetic material.

A mutant.

(linguistics) An alteration a particular sound of a word, especially the initial consonant, which is triggered by the word's morphological or syntactic context and not by its phonological context.

(law) The transfer of title of an asset in a register.

(rare, collective noun) A group of thrushes.