English
reasonability
From reason(able) + -ability.
Formed from reasonable + -ability
Latin reor ‘to reckon, think’
Latin ratiō ‘reason’
Latin ratiōnābilis ‘rational’
Old French resnable ‘wise’
Middle English resonable
English reasonable
Today it means
noun The state or quality of being reasonable.
Language periods are conventional ranges, not dates for this word.
Etymograph / reasonability