A0387600 (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.Thesaurus
aptitudinal - of or relating to aptitudes