A one
[ ey wuhn ]
/ ˈeɪ ˈwʌn /
adjective
noting a vessel regarded by a shipping-classification society as being equipped to the highest standard and with equipment maintained in first-class condition.
Also A number one. Informal.
first-class; excellent; superior: The meals there are A one.
Also
A-one,
A 1,
A-1.
Origin of A one
First recorded in 1830–40