This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Fitness; suitableness; appropriateness; as, the aptness of things to their end.

n. Disposition of the mind; propensity; as, the aptness of men to follow example.

n. Quickness of apprehension; readiness in learning; docility; as, an aptness to learn is more observable in some children than in others.

n. Proneness; tendency; as, the aptness of iron to rust.

n. Fitness; suitableness; appropriateness.

n. Disposition of the mind; propensity.

n. Quickness of apprehension; readiness in learning; docility.

n. Proneness; tendency.

n. The state or quality of being apt, in any sense of that word.

n. a disposition to behave in a certain way

n. appropriateness for the occasion

"Thus there was a certain aptness in his first publishers 'commission, which was to travel to the industrial north of England and write a report on the effects of unemployment and poverty on the lives of the working class."

disposition    appropriateness   

fitness    suitableness    appropriateness    propensity    docility    proneness    tendency   

versatility    cleverness    fleetness    perspicuity    sprightliness    adroitness    nimbleness    fluency    suppleness    quickness