Meaning of “undefeated” in the English Dictionary

british dictionary

"undefeated" in American English

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undefeatedadjective [ not gradable ]

us /ˌʌn·dɪˈfi·t̬ɪd/

never having lost, esp. a competition, within a particular period of time:

The Buffaloes upset No. 1-ranked and previously undefeated Wisconsin.

(Definition of “undefeated” from the Cambridge Academic Content Dictionary © Cambridge University Press)