/ Dictionary / Index S speciation: Meaning and Definition of Find definitions for: spe•ci•a•tion Pronunciation: (spē"shē-ā'shun, -sē-ā'-), [key] — n. Biol. the formation of new species as a result of geographic, physiological, anatomical, or behavioral factors that prevent previously interbreeding populations from breeding with each other. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: speciation (Thesaurus) specialty specie Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language