ace

the smallest whole number or a numeral representing this number; "he has the one but will need a two and three to go with it"; "they had lunch at one"

one of four playing cards in a deck having a single pip on its face

someone who is dazzlingly skilled in any field

proteolytic enzyme that converts angiotensin I into angiotensin II

a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey

a serve that the receiver is unable to reach

succeed at easily; "She sailed through her exams"; "You will pass with flying colors"; "She nailed her astrophysics course"

score an ace against; "He aced his opponents"

play (a hole) in one stroke

serve an ace against (someone)

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"