Meaning of A one

A one

Pronunciation: (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. first-class; excellent; superior: The meals there are A one.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.