in good health; physically fit first-class; excellent (of a vessel) with hull and equipment in first-class condition
WordReference Random House Learner's Dictionary of American English © 2026
A one or A 1/ˈeɪ ˈwʌn/USA pronunciation adj. [before a noun]
WordReference Random House Unabridged Dictionary of American English © 2026- Informal Termsfirst-class;
excellent:We ate at an A one restaurant.
A one
(ā′ wun′),USA pronunciation
- Naval Termsnoting a vessel regarded by a shipping-classification society as being equipped to the highest standard and with equipment maintained in first-class condition.
- Informal TermsAlso, A number one. first-class;
excellent;
superior:The meals there are A one.Also, A-one, A 1, A-1
- 1830–40
Collins Concise English Dictionary © HarperCollins Publishers::
'A one' also found in these entries (note: many are not synonyms or translations):
A number 1
- A, a
- A-1
- A1
- Cape Cod
- Congo
- Klein bottle
- Krugerrand
- Möbius strip
- Sierra Leone
- Zimbabwe
- ace
- alright
- big one
- biuniqueness
- bluebell
- body stocking
- bodysuit
- boilersuit
- bungalow
- centroid
- chaise
- cherry
- circumference
- combinations
- corselet
- cosmic string
- countable
- creeper
- denumerable
- dress
- edition
- einkorn
- enemy
- flyover
- harrier
- holiday
- injection
- isomorphism
- jump suit
- jumper
- jumpsuit
- luge
- maple leaf
- miler
- monocycle
- monomorphism
- moving violation
- no
- number line