'anticonstitutionality' originates from English combining the prefix 'anti-' (from Greek 'anti') meaning 'against' and the noun 'constitution' (from Latin 'constitutio') with the suffix '-ity' forming a noun meaning 'the state or quality of'.

'constitution' changed from Latin 'constitutio' through Old French 'constitucion' and Middle English 'constitution'; the combining form 'anti-' entered English via Greek/Latin usage, forming 'anticonstitutional' and later the noun 'anticonstitutionality'.

Initially used to indicate opposition to a particular constitution or constitutional principle, it evolved into a legal/technical noun meaning 'the condition or quality of being unconstitutional'.