Etymology
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aptitude (n.)

early 15c., "tendency, likelihood," from Late Latin aptitudo (genitive aptitudinis) "fitness," noun of quality from Latin aptus "joined, fitted" (see apt). Meaning "natural capacity to learn" is 1540s; that of "state or quality of being fit (for a purpose or position)" is from 1640s. Related: Aptitudinal. A doublet of attitude.

updated on January 31, 2017

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Definitions of aptitude from WordNet

aptitude (n.)
inherent ability;
From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near aptitude

apse

apsis

apt

apterous

apteryx

aptitude

aptly

aptness

aqua-

aqua

aqua fortis