ace ace /eɪs/

adjective

1. Of the highest quality  ( A-one , ace , tiptop , crack , first-rate , super , top-notch , topnotch , tops )
   of the highest quality
    An ace reporter
   an ace reporter
    A crack shot
   a crack shot
    A first-rate golfer
   a first-rate golfer
    A super party
   a super party
    Played top-notch tennis
   played top-notch tennis
    An athlete in tiptop condition
   an athlete in tiptop condition
    She is absolutely tops
   she is absolutely tops
   

noun

1. () The smallest whole number or a numeral representing this number  ( I , single , unity , 1 , ace , one )
   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
   he has the one but will need a two and three to go with it
    They had lunch at one
   they had lunch at one
   
2. () One of four playing cards in a deck having a single pip on its face  ( ace )
   one of four playing cards in a deck having a single pip on its face
    He played an ace on the first hand of the game
   He played an ace on the first hand of the game
   
   
3. () [Informal] Someone who is dazzlingly skilled in any field  ( adept , champion , maven [Informal, American] , genius , mavin [Informal, American] , superstar , whizz [Informal] , wiz [Informal] , megastar [Informal] , ace [Informal] , hotshot [Informal] , sensation , star , virtuoso , whiz [Informal] , wizard [Informal] )
   someone who is dazzlingly skilled in any field
     The talented star dazzled audiences with her captivating performances on the stage.
   The talented star dazzled audiences with her captivating performances on the stage.
   
4. A serve that the receiver is unable to reach  ( ace )
   a serve that the receiver is unable to reach
    In tennis, an ace is a serve that is not touched by the receiver and results in a point for the server
   In tennis, an ace is a serve that is not touched by the receiver and results in a point for the server
   

verb

1. (tennis) serve an ace against (someone)  ( ace )
   (tennis) serve an ace against (someone)
   
2. (golf) play (a hole) in one stroke  ( ace )
   (golf) play (a hole) in one stroke
   
3. Score an ace against  ( ace )
   score an ace against
    He aced his opponents
   He aced his opponents
   
4. Succeed at easily  ( ace , breeze through , nail , pass with flying colors , sail through , sweep through )
   succeed at easily
    She sailed through her exams
   She sailed through her exams
    You will pass with flying colors
   You will pass with flying colors
    She nailed her astrophysics course
   She nailed her astrophysics course
   

 ACE

noun

1. A major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey  ( ACE , Allied Command Europe )
   a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey
   
2. Proteolytic enzyme that converts angiotensin I into angiotensin II  ( ACE , angiotensin converting enzyme , angiotensin-converting enzyme )
   proteolytic enzyme that converts angiotensin I into angiotensin II