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Definition of aptness : 1. Disposition of the mind; propensity; as, the aptness of men to follow example.
2. Fitness; suitableness; appropriateness; as, the aptness of things to their end.
3. Proneness; tendency; as, the aptness of iron to rust.
4. Quickness of apprehension; readiness in learning; docility; as, an aptness to learn is more observable in some children than in others.

Synonyms:

ability, turn, genius, aptitude, instinct, seemliness, felicitousness, faculty, suitableness, fittingness, flair, properness, way, happiness, head, knack, talent, rightness, gift, approach, appositeness

efficiency, timeliness, advantageousness, expedience, fitness, desirability, well-timedness, effectiveness, suitability, opportunity, propriety, convenience

likelihood, liability, plausibility, possibility, probability, chance

grain, predilection, proclivity, bias, penchant, trend, propensity, course, bent, predisposition, tenor, direction, inclination, affinity, disposition, temperament, proneness, tendency, polarity, leaning

appropriateness, felicity

Usage examples:

• " My friend in Harrisburg wrote me of your ambition and, I may say, aptness for the forest service. - "The Young Forester", Zane Grey.
• His words had a singular aptness, for he had hardly uttered them when Roderick came out from the house, evidently in his darkest mood. - "Roderick Hudson", Henry James.
• Who knows how,- in this spiritual Kindergarten of a world,- the rudiments of all small human devices were set in human faculty and aptness for its own object- teaching toward a perfect heavenly enlightenment? - "The Other Girls", Mrs. A. D. T. Whitney.