Aptness

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

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.