Assume and presume both mean "to take something for granted" or "to take something as true," but the words differ in the degree of confidence the person assuming or presuming has. Presume is used when someone is making an informed guess based on reasonable evidence. Assume is used when the guess is based on little or no evidence.
Presume functions a little differently in the legal catchphrase "presumed innocent until proven guilty." That sense of presume is separately defined as "to suppose to be true without proof." It is based on the fact that legal systems grant a defendant the presumption of innocence, thereby placing the burden of proof on the prosecution.
assume often implies a justifiable motive rather than an intent to deceive.
assumed an air of cheerfulness around the patients
affect implies making a false show of possessing, using, or feeling.
affected an interest in art
pretend implies an overt and sustained false appearance.
pretended that nothing had happened
simulate suggests a close imitation of the appearance of something.
cosmetics that simulate a suntan
feign implies more artful invention than pretend, less specific mimicry than simulate.
feigned sickness
counterfeit implies achieving the highest degree of verisimilitude of any of these words.
an actor counterfeiting drunkenness
sham implies an obvious falseness that fools only the gullible.
shammed a most unconvincing limp
Example Sentences
I assumed he was coming, so I was surprised when he didn't show up. She assumed from his expression that he was confused. We'll be arriving around noon. That's assuming that our flight is on time. The king assumed the throne when he was very young. Under certain conditions, the chemical will assume the appearance of ice.
Recent Examples on the WebNor is there any reason to assume that the Capitol Police or the Metropolitan Police was immune from the insidious bigotry, or infiltration by white supremacists, that plagued other police departments. Luke Mogelson, The New Yorker, 10 Sep. 2022 At 73, King Charles III is the oldest person to assume the British throne. Matthew Mulligan, NBC News, 10 Sep. 2022 Charles, the oldest person to ever assume the British throne, became King Charles III on Thursday following the death of his mother, Queen Elizabeth II. Danica Kirka, Chicago Tribune, 8 Sep. 2022 Journalists seem to assume that the platform’s petty arguments are some kind of real-time snapshot of public opinion.WIRED, 8 Sep. 2022 Charles, the oldest person to ever assume the British throne, became King Charles III on Thursday following the death of his mother, Queen Elizabeth II. Danica Kirka, ajc, 8 Sep. 2022 Charles became the 62nd British monarch to assume the throne. Tomás Mier, Rolling Stone, 8 Sep. 2022 Charles, the oldest person to ever assume the British throne, became King Charles III on Thursday following the death of his mother, Queen Elizabeth II. Danica Kirka, Anchorage Daily News, 8 Sep. 2022 The producer was in negotiations to assume the expansive role encompassing film and television for the comic book brand, but talks broke down in recent days. Aaron Couch, The Hollywood Reporter, 6 Sep. 2022 See More
Word History
Etymology
Middle English, from Latin assumere, from ad- + sumere to take — more at consume