The term 'AYE ANTITHESIS' is a phrase used to describe two opposing ideas or concepts. The word 'AYE' is derived from the Old English word for 'YES' and is used to express agreement or approval. The word 'ANTITHESIS' is derived from the Greek word for 'OPPOSITION' and is used to describe two contrasting ideas or concepts. The crossword solution for this term is 'NAY, ' which is the opposite of 'AYE' and is used to express disagreement or disapproval.