Fromapt +‎-ness.

• IPA^(key): /ˈæptnəs/

• Audio(UK):

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aptness (countable anduncountable,pluralaptnesses)

1. suitability; the quality of beingapt orsuitable
   • 1962 August, G. Freeman Allen, “Traffic control on the Great Northern Line”, inModern Railways, page128:

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

2. disposition of themind;propensity

   theaptness of men to follow example

3. speed or readiness inlearning;docility

   Anaptness to learn is more observable in some children than in others.

4. proneness;tendency

   theaptness of iron to rust

• “aptness”, inWebster’s Revised Unabridged Dictionary, Springfield, Mass.:G. & C. Merriam,1913,→OCLC.

• Stepans,patness,pantses,pesants,septans

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