1. Fitness; suitableness; appropriateness; as, the aptness of things to their end.
The aptness of his quotations. --J. R. Green.
2. Disposition of the mind; propensity; as, the aptness of men to follow example.
3. Quickness of apprehension; readiness in learning; docility; as, an aptness to learn is more observable in some children than in others.
4. Proneness; tendency; as, the aptness of iron to rust.
n 1: a disposition to behave in a certain way; "the aptness of
iron to rust"; "the propensity of disease to spread"
2: appropriateness; "the phrase had considerable aptness" [syn:
appositeness] [ant: inaptness, inaptness]