'antinomy' originates from Greek, specifically the word 'antinomia' (ἀντινομία), where 'anti-' meant 'against' and 'nomos' meant 'law.'

'antinomy' changed from Greek 'antinomia' into Latin and then entered English (via Medieval/Modern Latin and French 'antinomie'), eventually becoming the modern English word 'antinomy.'

Initially, it meant 'opposition to law' or a conflict of laws/commands; over time it evolved into the current meaning of 'a contradiction between two reasonable principles or conclusions,' especially in philosophical contexts.