Meaning of A ONE in English

A ONE

/ay" wun"/

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

[ 1830-40 ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .