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a. d.

From Wiktionary, the free dictionary

Latin

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Alternative forms

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Phrase

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a. d.

  1. Initialism of ante diem.
    a. d. III[.] Nōn. Febr.
    [ante diem tertium Nōnās Februāriās]
    3rd February

Usage notes

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  • Commonly combined with a Roman numeral; Kal., Nōn., or Īd.; and an abbreviated month to give a date according to the Roman calendar. For details regarding its irregular grammar and usage, see diēs.