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[myoo-tey-shuh n] /myuˈteɪ ʃən/
  1. a sudden departure from the parent type in one or more heritable characteristics, caused by a change in a gene or a chromosome.
  2. an individual, species, or the like, resulting from such a departure.
the act or process of changing.
a change or alteration, as in form or nature.
Phonetics, umlaut.
Linguistics. (in Celtic languages) syntactically determined morphophonemic phenomena that affect initial sounds of words.
1325-75; Middle English mutacio(u)n < Latin mūtātion- (stem of mūtātiō) a changing. See mutate, -ion
Related forms
mutational, adjective
mutationally, adverb
nonmutational, adjective
nonmutationally, adverb
unmutational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mutationally


the act or process of mutating; change; alteration
a change or alteration
a change in the chromosomes or genes of a cell. When this change occurs in the gametes the structure and development of the resultant offspring may be affected See also inversion (sense 11)
another word for mutant (sense 1)
a physical characteristic of an individual resulting from this type of chromosomal change
  1. (in Germanic languages) another name for umlaut
  2. (in Celtic languages) a phonetic change in certain initial consonants caused by a preceding word
Derived Forms
mutational, adjective
mutationally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for mutationally
late 14c., "action of changing," from L. mutationem (nom. mutatio) "a changing," from mutatus, pp. of mutare "to change" (see mutable). Genetic sense is from 1894.
Online Etymology Dictionary, © 2010 Douglas Harper
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mutationally in Medicine

mutation mu·ta·tion (myōō-tā'shən)

  1. The act or process of being altered or changed.

  2. An alteration or change, as in nature, form, or quality.

  3. A sudden structural change within a gene or chromosome of an organism resulting in the creation of a new character or trait not found in the parental type.

  4. The process by which such a sudden structural change occurs, either through an alteration in the nucleotide sequence of the DNA coding for a gene or through a change in the physical arrangement of a chromosome.

  5. A mutant.

mu·ta'tion·al adj.
mu·ta'tion·al·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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mutationally in Science
A change in the structure of the genes or chromosomes of an organism. Mutations occurring in the reproductive cells, such as an egg or sperm, can be passed from one generation to the next. Most mutations occur in junk DNA and have no discernible effects on the survivability of an organism. Of the remaining mutations, the majority have harmful effects, while a minority can increase an organism's ability to survive. A mutation that benefits a species may evolve by means of natural selection into a trait shared by some or all members of the species. See Note at sickle cell anemia.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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