mutation

noun6

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

   • Birdwatchers would enjoy a host of sparrows, a herd of swans, a descent of woodpeckers, a herd of wrens, and mutation of thrushes. — 1984