ap·ti·tude
(ăp′tĭ-to͞od′, -tyo͞od′)n.1. An inherent ability, as for learning; a talent: an aptitude for mathematics.
2. Archaic The condition or quality of being suitable; appropriateness.
[Middle English, tendency, from Late Latin aptitūdō, aptitude, from Latin aptus, apt; see apt.]
ap′ti·tu′di·nal (-to͞od′n-əl, -tyo͞od′-) adj.
ap′ti·tu′di·nal·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.
aptitudinally
(ˌæptɪˈtjuːdɪnəlɪ) advobsolete in a manner that indicates aptitude
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014