Early 17th century; earliest use found in George Wither (1588–1667), poet. From sub- + contrariety, after subcontrary and post-classical Latin subcontrarietas.
Definition of subcontrariety in US English:
subcontrariety
nounˌsʌbkɒntrəˈrʌɪɪti
Logic
The relation between subcontrary propositions.
Origin
Early 17th century; earliest use found in George Wither (1588–1667), poet. From sub- + contrariety, after subcontrary and post-classical Latin subcontrarietas.