What do a.m. and p.m. stand for?


[mak-roh-ev-uh-loo-shuh n or, esp. British, -ee-vuh-] /ˌmæk roʊˌɛv əˈlu ʃən or, esp. British, -ˌi və-/
noun, Biology
major evolutionary transition from one type of organism to another occurring at the level of the species and higher taxa.
Origin of macroevolution
1935-40; macro- + evolution
Related forms
macroevolutionary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for macroevolution
  • Some teach evolutionary biology as though it only applies to molecular biology-completely ignoring macroevolution of species.
British Dictionary definitions for macroevolution


(biology) the evolution of large taxonomic groups such as genera and families
Derived Forms
macroevolutionary, adjective
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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macroevolution in Science
Evolution that results in the formation of a new taxonomic group above the level of a species.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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