a-one

Adjective a-one has 1 sense

• a-one(s = adj.all) ace, crack, first-rate, super, tiptop, top-notch, topnotch, tops - of the highest quality; "an ace reporter"; "a crack shot"; "a first-rate golfer"; "a super party"; "played top-notch tennis"; "an athlete in tiptop condition"; "she is absolutely tops"