[mak-roh-ev-uh-loo-shuh
n or, especially Brit., -ee-vuh-] 
| major evolutionary transition from one type of organism to another occurring at the level of the species and higher taxa. |
| mac·ro·ev·o·lu·tion (māk'rō-ěv'ə-lōō'shən, -ē'və-) n. Large-scale evolution occurring over geologic time that results in the formation of new taxonomic groups. mac'ro·ev'o·lu'tion·ar'y (-shə-něr'ē) adj. |
macroevolution (māk'rō-ěv'ə-l 'shən) Pronunciation Key
Evolution that results in the formation of a new taxonomic group above the level of a species. |