Synesis

Synesis is a traditional grammatical/rhetorical term derived from Greek σύνεσις (originally meaning "unification, meeting, sense, conscience, insight, realization, mind, reason").

A constructio kata synesin (or constructio ad sensum in Latin) means a grammatical construction in which a word takes the gender or number not of the word with which it should regularly agree, but of some other word implied in that word. It is effectively an agreement of words with the sense, instead of the morphosyntactic form.