-taxissuff.1. Order; arrangement: homotaxis.2. Responsive movement; taxis: chemotaxis.[From Greek, from taxis; see taxis.]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.-taxis or -taxyn combining form1. indicating movement towards or away from a specified stimulus: thermotaxis. 2. order or arrangement: phyllotaxis. [from New Latin, from Greek taxis order] -tactic, -taxic adj combining formCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tax?is (?tæk s?s) n., pl. tax?es (?tæk siz) 1. arrangement or order, as in one of the physical sciences. 2. oriented movement of a motile organism in response to an external stimulus, as toward light. 3. the repositioning of a displaced body part by manipulation without cutting. [1720?30;