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