reasonability
/ˌriːz(ə)nəˈbɪlɪti/ /ˌriːz(ə)nəˈbɪlɪti/noun
The quality or capacity of being reasonable; reasonableness.
Origin
Mid 17th century; earliest use found in Thomas Urquhart (1611–1660), author and translator. From reasonable + -ity: see -bility.