aptitude Copy link Outline 1. hăbĭlĭtas (v. rare)2. ingĕnĭum (i. e. ability, genius; q. v.) • aptitude: i. e. natural tendency or fitness: 1. hăbĭlĭtas (v. rare): the a.s of the body, habilitates corporis, Cic. 2. ingĕnĭum (i. e. ability, genius; q. v.): a. for invention, ad fingendum i., Cic.: v. fitness, suitableness.