/ Dictionary / Index M macroevolution: Meaning and Definition of Find definitions for: mac•ro•ev•o•lu•tion Pronunciation: (mak"rō-ev"u-l'shun or, esp. Brit., -ē"vu-), [key] — n. Biol. major evolutionary transition from one type of organism to another occurring at the level of the species and higher taxa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: macroevolution (Thesaurus) macroetch macroform Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language