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as·sum·ing | \ ə-ˈsü-miŋ 
\
\Definition of assuming
: having or showing the attitude of someone who assumes something that should not be assumed : pretentious, presumptuous … I caught him boasting … about how popular he had become. Oh well, he could have been joking only, but to me I find it very assuming of him.— Ryan Mark "When there are conversations centering around sexual assault, they tend to be very assuming of heterosexual dynamics."— Justice Gaines When speaking about newly signed left guard Andrew Norwell, [Tom] Coughlin was quick to speak in a very assuming way of how this offense is going to play.— Ryan Day
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Time Traveler for assuming
The first known use of assuming was in 1667
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