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A 1

Defined in 1 dictionary — Black's (1910)

Black's Law Dictionary

Henry Campbell Black, M.A. · 1910

Of the highest qualities. An expression which originated in a practice of underwriters of rating vessels in three classes,
—A, B, and C; and these again in ranks numbered. Abbott A description of a ship as "A 1" amounts to a warranty. Ollive v. Booker, 1 Exch. 423.