tax·on·o·my (t?k-s?n??-m?)n. pl. tax·on·o·mies 1. The classification and naming of organisms in an ordered system that is intended to indicate natural relationships, especially evolutionary relationships.2. The science, laws, or principles of classification.3. An ordered arrangement of groups or categories: a taxonomy of literary genres.[French taxonomie : Greek taxis, arrangement; see taxis + -nomie, method (from Greek -nomi?; see -nomy).]tax·on?o·mist n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.taxonomy (tæk?s?n?m?) n1. (Biology) a. the branch of biology concerned with the classification of organisms into groups based on similarities of structure, origin, etcb. the practice of arranging organisms in this way2. the science or practice of classification[C19: from French taxonomie, from Greek taxis order + -nomy] taxonomic, ?taxo?nomical adj ?taxo?nomically adv tax?onomist, tax?onomer nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tax?on?o?my (tæk?s?n ? mi) n. 1. the science or technique of classification. 2. the science dealing with the description, identification, naming, and classification of organisms. 3. any classification, esp. the systematic classification of organisms into hierarchical groups or taxa. [1805?15;