pe·cu·ni·ar·y (p?-kyo?o?n?-?r??)adj.1. Of or relating to money: a pecuniary loss; pecuniary motives.2. Requiring payment of money: a pecuniary offense.[Latin pec?ni?rius, from pec?nia, property, wealth; see peku- in Indo-European roots.]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.pecuniary (p??kju?n??r?) adj1. consisting of or relating to money2. (Law) law (of an offence) involving a monetary penalty[C16: from Latin pec?ni?ris, from pec?nia money] pe?cuniarily advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014pe?cu?ni?ar?y (p??kyu ni??r i) adj. 1. of, pertaining to, or consisting of money. 2. (of a legal offense) involving a money penalty or fine. [1495?1505;