DictionaryA onePronunciation: (ā' wun'), [key] 1. noting a vessel regarded by a shipping-classification society as being equipped to the highest standard and with equipment maintained in first-class condition. 2. Also,A number one. Informal.first-class; excellent; superior: The meals there are A one. Also,A-one,A 1,A-1 Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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