The term 'CASE IN LAT. GRAMMAR' can be summarized as a grammatical concept in Latin, where the form of a noun, pronoun, or adjective is determined by its function in a sentence. The crossword solution for this term is 'DAT', which stands for the dative case, which is used to indicate the indirect object of a sentence. The dative case is one of the six cases in Latin grammar, and it is used to indicate the recipient of an action.