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

ace

adjective
 
/eɪs/
 
/eɪs/
(informal)
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  1. very good
    • We had an ace time.
    Word OriginMiddle English (denoting the “one” on dice): via Old French from Latin as ‘unity, a unit’.
See ace in the Oxford Advanced American Dictionary
buttercup
noun
 
 
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