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assuming

adjective
as·​sum·​ing

Definition of assuming

: pretentious, presumptuous

First Known Use of assuming

1667, in the meaning defined above

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Time Traveler for assuming

The first known use of assuming was in 1667

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More from Merriam-Webster on assuming

Nglish: Translation of assuming for Spanish Speakers

Britannica English: Translation of assuming for Arabic Speakers

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