[ap-ti-tood, -tyood]
capability; ability; innate or acquired capacity for something; talent: She has a special aptitude for mathematics.
readiness or quickness in learning; intelligence: He was placed in honors classes because of his general aptitude.
the state or quality of being apt; special fitness.

1400–50; late Middle English (< Middle French) < Late Latin aptitūdō. See apt, -i-, -tude

aptitudinal, adjective
aptitudinally, adverb
preaptitude, noun

1. predilection, proclivity, bent, gift, faculty. 2. acumen. 3. appropriateness.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aptitude (ˈæptɪˌtjuːd)
1.  inherent or acquired ability
2.  ease in learning or understanding; intelligence
3.  the condition or quality of being apt
[C15: via Old French from Late Latin aptitūdō, from Latin aptusapt]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1540s, "quality of being fit for a purpose or position," from L.L. aptitudo (gen. aptitudinis) "fitness," noun of quality from L. aptus "joined, fitted" (see apt).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Our aim is more to discover writing talent in a science student or scientist
  than a scientific aptitude in a budding journalist.
Both require far more than just math aptitude.
His scientific aptitude was not immediately apparent.
While discovering your interests is a good first step, you will have to
  appraise your aptitudes, too.
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