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Wiktionary
ablative case

n. (context grammar English) A noun case used in some languages to indicate movement '''away from''' something, removal, separation. It corresponds roughly to the use in English of prepositions "of", "from", "away from", and "concerning".

WordNet
ablative case

n. the case indicating the agent in passive sentences or the instrument or manner or place of the action described by the verb [syn: ablative]

Wikipedia
Ablative case

The ablative case ( abbreviated ) is a grammatical case in the grammar of various languages; it is used generally to express motion away from something, although the precise meaning may vary by language. The word "ablative" derives from the Latin ablatus, the (irregular) perfect passive participle of auferre "to carry away". There is no ablative case in modern Germanic languages such as English.