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A-one
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Quick answer
As an adjective, A-one means of the highest quality.
Meanings of A-one
1 meaningadjective
Of the highest quality
“an ace reporter”
“a crack shot”
“a first-rate golfer”
Similar: ace, crack, first-rate, super, tiptop, topnotch
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).