Meaning

1. Any alteration or change.
2. Any heritable change of the base-pair sequence of genetic material.
3. A mutant.
4. An alteration in 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.
5. The transfer of title of an asset in a register.
6. A group of thrushes.