in Grammar, the sixth case of Latin nouns. The word is formed from ablatus, the participle of auferre, "to take away." Priscian calls it also the comparative case; as serving among the Latins for comparing, as well as taking away.

The ablative is opposite to the dative; the first expressing the action of taking away, and the latter that of giving.

In English, French, &c., there is no precise mark whereby to distinguish the ablative from other cases; and we only use the term from analogy to the Latin.

The question concerning the Greek ablative has been the subject of a famous literary war between two great grammarians, Frischlin and Crusius; the former maintaining, and the latter opposing, its existence. The dispute still subsists among their respective followers. The chief reason alleged by the former is, that the Roman writers often joined Greek words with the Latin prepositions which govern ablative cases, as well as with nouns of the same case. To which their opponents answer, that the Latins anciently had no ablative themselves, but instead thereof made use, like the Greeks, of the dative case; till at length they formed an ablative, governed by prepositions, which were not put before the dative: that, at first, the two cases had always the same termination, as they still have in many instances; but that this was afterwards changed in certain words. It is no wonder, then, that the Latins sometimes join prepositions which govern an ablative case, or nouns in the ablative case, with Greek datives, since they were originally the same; and that the Greek dative has the same effect as the Latin ablative.