ner·va·tion (nûr-v??sh?n)n. A pattern of veins or nerves; venation.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.nervation (n???ve???n) or nervaturen (Biology) a less common word for venationCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ve?na?tion (vi?ne? ??n, v?-) n. 1. the arrangement of veins, as in a leaf or in the wing of an insect. 2. these veins collectively. [1640?50;