Английский разговорный словарь (основной) - mutation

mju:ˈteɪʃən n. 1 the process or an instance of change or alteration. 2 a genetic change which, when transmitted to offspring, gives rise to heritable variations. 3 a mutant. 4 a an umlaut. b (in a Celtic language) a change of a consonant etc. determined by a preceding word. øømutational adj. mutationally adv. [ME f. L mutatio f. mutare change]