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1a: An act or the process of returning (as to a former condition); b: a return toward an ancestral type or condition: reappearance of an ancestral character. 2 : A product of reversion; specifically: an organism with an atavistic character.

Definition from: Merriam-Webster's Medical DictionaryThis link leads to a site outside Genetics Home Reference. by Merriam-Webster Inc.

See also Understanding Medical Terminology.

Published: October 27, 2014