aptness
noun/ˈæptnəs/
Etymology From apt + -ness.
1
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, [...].1962 August, G. Freeman Allen, “Traffic control on the Great Northern Line”, in Modern Railways, page 128:
2
Disposition of the mind; propensity.
- the aptness of men to follow example
3
Speed or readiness in learning; docility.
- An aptness to learn is more observable in some children than in others.
4
Proneness; tendency.
- the aptness of iron to rust