ge·net·ic (j?-n?t??k) also ge·net·i·cal (-?-k?l)adj.1. a. Of or relating to genetics or genes.b. Affecting or determined by genes: genetic diseases.2. Of, relating to, or influenced by the origin or development of something.3. Linguistics Of or relating to the relationship between or among languages that are descendants of the same language.[From Greek genetikos, genitive, from genesis, origin; see genesis.]ge·net?i·cal·ly adv.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.genetic (d???n?t?k) or geneticaladj (Genetics) of or relating to genetics, genes, or the origin of something[C19: from genesis] ge?netically advCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ge?net?ic (d???n?t ?k) also ge?net?i?cal, adj. 1. pertaining or according to genetics. 2. of, pertaining to, or produced by genes; genic. 3. of, pertaining to, or influenced by geneses or origins. [1825?35; gene (sis) + -tic] ge?net?i?cal?ly, adv. -genetic a combining form of adjectives corresponding to nouns ending in -genesis: parthenogenetic. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.