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

 

mammoth

 adjective
adjective
BrE BrE//ˈmæməθ//
 
; NAmE NAmE//ˈmæməθ//
 
 
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[usually before noun] extremely large synonym huge a mammoth task a financial crisis of mammoth proportions Word Origin early 18th cent.: from Russian mamo(n)t, probably of Siberian origin.
See the Oxford Advanced American Dictionary entry: mammoth

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