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

undefined

adjective

/ˌʌndɪˈfaɪnd/

/ˌʌndɪˈfaɪnd/

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not made clear or definite
- The money was lent for an undefined period of time.
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See undefined in the Oxford Advanced American DictionarySee undefined in the Oxford Learner's Dictionary of Academic English

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