I. adjective 1.
[Grammar] denoting a case (especially in Latin) of nouns and pronouns and words in grammatical agreement with them indicating an agent, instrument, or source, expressed by ‘by’, ‘with’, or ‘from’ in English.
2. (of surgical treatment) involving ablation. • all nine patients were treated by ablative surgery.
3. relating to or subject to ablation through melting or evaporation • the spacecraft’s ablative heat shield.
II. noun 1.
[Grammar] a word in the ablative case.
2. ( the ablative) —
[Grammar] the ablative case.
– origin late Middle English: from Old French ablative (feminine of ablatif), Latin ablativus, from ablat- ‘taken away’ (see ablation).