n.

1. 变化；浮沉盛衰；变质
2. 元音变化
3. 【生】变种，突变
   This giant spider was created out of the mutation of the genes of a normal spider.

   这只超大蜘蛛是因为普通蜘蛛基因突变而形成的。

n.

1. the action or process of changing in form or nature.
   ▸a change.
2. a change in the structure of a gene resulting in a variant form which may be transmitted to subsequent generations.
   ▸a distinct form resulting from genetic mutation.
3. Linguistics  (in Celtic languages) change of an initial consonant in a word caused by the preceding word.
   ▸(in Germanic languages) the umlaut process.