1) Appropriateness 2) Degree of fit 3) Disposition 4) Fitness 5) Pertinence 6) Propensity 7) Quality of fitting 8) Relevance 9) Suitability Found on https://www.crosswordclues.com/clue/aptness
• (n.) Quickness of apprehension; readiness in learning; docility; as, an aptness to learn is more observable in some children than in others. • (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.) Pronene... Found on http://thinkexist.com/dictionary/meaning/aptness/
Apt'ness noun 1. Fitness; suitableness; appropriateness; as, the aptness of things to their end. « The aptness of his quotations. J. R. Green. » 2. Disposition of the mind; propensity; as, the aptness of men to follow example. 3. Qu... Found on http://www.encyclo.co.uk/webster/A/111
noun a disposition to behave in a certain way; `the aptness of iron to rust`; `the propensity of disease to spread` Found on https://www.encyclo.co.uk/local/20974