par ex·cel·lence (pär ?k-s?-läNs?)adj. Being the best or truest of a kind; quintessential: a diplomat par excellence.[French : par, by + excellence, preeminence.]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.par excellence (par ?ks?l??s; English p??r ??ks?l?ns) advto a degree of excellence; beyond comparison: she is the charitable lady par excellence. [literally: by (way of) excellence]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014par ex?cel?lence (p?r ??k s??l?ns, ??k s??læns) adj. being an example of excellence; superior: an orator par excellence. [