aptness

noun

1. (countable, uncountable)Suitability; the quality of being apt or suitable.

   “A regular supply of coking slack is sent from Durham to the Scunthorpe area, in view of its special aptness for steelmaking processes, [...].”

2. (countable, uncountable)Disposition of the mind; propensity.

   “the aptness of men to follow example”

3. (countable, uncountable)Speed or readiness in learning; docility.

   “An aptness to learn is more observable in some children than in others.”

4. (countable, uncountable)Proneness; tendency.

   “the aptness of iron to rust”