Definition of undefeated adjective from the Oxford Advanced American Dictionary

 

undefeated

 adjective
adjective
NAmE//ˌʌndɪˈfit̮əd//
 
 
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(especially in sports) not having lost or been defeated They are undefeated in 13 games. the undefeated world champion
See the Oxford Advanced Learner's Dictionary entry: undefeated