One of the mysteries of the English language finally explained.
For an occasion as it arises; extempore, without prior provision; as required, as needed.
Of a meeting, council, etc.: extraordinary, held or called to deal with a specific matter. Also more generally: resulting from or responding to particular circumstances.
Late 16th century. From classical Latin prō rē nātā in the circumstances, lit. ‘for the affair born’ from prō + rē, ablative of rēs thing, affair + nātā, ablative feminine of nātus born, past participle of nāscī to be born.
pro re nata/(ˌ)prəʊ reɪ ˈnɑːtə/
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