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Definition of aptitude : 1. A general fitness or suitableness; adaptation.
2. A natural or acquired disposition or capacity for a particular purpose, or tendency to a particular action or effect; as, oil has an aptitude to burn.
3. Readiness in learning; docility; aptness.

Synonyms:

expertness, faculty, propensity, head, turn, cleverness, readiness, quickness, aptness, instinct, gift, tendency, approach, bent, inclination, capacity

craft, proficiency, adeptness, dexterity, deftness, know-how, competence, adroitness, knack, ability, flair, experience, facility, acuity, technique, skill, genius, talent, expertise, capability, artfulness, mastery, cunning

Usage examples:

• But from what I have seen and heard as yet, it appears to me that the Confederates possess certain great qualities as soldiers, such as individual bravery and natural aptitude in the use of firearms, strong, determined patriotism, and boundless confidence in their favourite generals, and in themselves. - "Three Months in the Southern States, April-June 1863", Arthur J. L. (Lieut.-Col.) Fremantle.
• How that race was run, and how both Prime Minister and Quousque were beaten by an outsider named Fishknife, Prime Minister, however, coming in a good second, the present writer having no aptitude in that way, cannot describe. - "The Duke's Children", Anthony Trollope.
• It is possible, of course, to give training to those who have the aptitude. - "Analyzing Character", Katherine M. H. Blackford and Arthur Newcomb.