Regular change of a sound when it occurs adjacent to another, in particular
(in Germanic languages) The process by which the quality of a vowel was altered in certain phonetic contexts; umlaut
The changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes
MUTATION, the act of changing in form [n]
(in Celtic languages) Change of an initial consonant in a word caused (historically) by the preceding word
MUTATION, the act of changing (to make or become different) [n]