Definition of ace adjective from the Oxford Advanced Learner's Dictionary

 

ace

 adjective
adjective
BrE BrE//eɪs//
 
; NAmE NAmE//eɪs//
 
 
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(informal) very good We had an ace time. Word Origin Middle English (denoting the “one” on dice): via Old French from Latin as ‘unity, a unit’.
See the Oxford Advanced American Dictionary entry: ace