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Aptness (n.) Fitness; suitableness; appropriateness; as, the aptness of things to their end.
Aptness (n.) Disposition of the mind; propensity; as, the aptness of men to follow example.
Aptness (n.) Quickness of apprehension; readiness in learning; docility; as, an aptness to learn is more observable in some children than in others.
Aptness (n.) Proneness; tendency; as, the aptness of iron to rust.