How to Use assumption in a Sentence

assumption

noun
  • I'm telling you our arrival time on the assumption that you will check to see whether or not our flight is on time before you come to the airport.
  • Her plan is based on the underlying assumption that the economy will improve in the near future.
  • I made the assumption that he was coming, so I was surprised when he didn't show up.
  • He will come home tomorrow. At least, that's my assumption.
  • Many scientific assumptions about Mars were wrong.
  • But this case shows that assumption can fall apart fast.
    — Kurt Knutsson, FOXNews.com, 17 June 2026
  • That’s been the assumption for a very long time.
    — Fiction Non Fiction, Literary Hub, 19 Feb. 2026
  • Come ready to shed any rigid assumptions and play.
    — Lilliam Rivera, Los Angeles Times, 13 Mar. 2026
  • There’s this assumption that what sells best is your best work.
    — Lily Moayeri, SPIN, 9 Oct. 2024
  • That can be a risky assumption.
    — Expert Panel®, Forbes.com, 23 June 2026
  • Brigitte flipped that assumption on its head.
    — Mariel Carr, Scientific American, 20 Mar. 2026
  • How did that assumption work out?
    — Daniel Depetris, Chicago Tribune, 31 Mar. 2026
  • That assumption just took a hit.
    — Kurt Knutsson, FOXNews.com, 5 Feb. 2026
  • Where did my assumptions come from?
    — Ed Gaskin, Boston Herald, 10 Feb. 2026
  • This assumption breaks down in a world that shifts in real time.
    — Big Think, 4 Mar. 2026
  • Or at Google’s assumption his own name must be spelled wrong.
    — Washington Post, 9 Jan. 2022
  • What assumptions must be true for the thesis to work?
    — Jim Osman, Forbes.com, 25 June 2026
  • There was hope and an assumption the tourney might get pushed back a year.
    — Randy McRoberts, Baltimore Sun, 5 Aug. 2022
  • And Richard is quite right, all the assumptions have been wrong here.
    — ABC News, 26 Apr. 2026
  • That assumption made sense when it was formed, but is less true today.
    — Ethan Pronev, Forbes.com, 28 May 2026
  • That's a risky assumption, though.
    — Angelica Leicht, CBS News, 27 Jan. 2026
  • Every one of these assumptions has been proven wrong.
    — ABC News, 26 Apr. 2026
  • This assumption is where things break down in practice.
    — Rupendra Brahambhatt, Interesting Engineering, 19 Apr. 2026
  • Your friend has made assumptions that never got checked.
    — Harriette Cole, Mercury News, 3 Apr. 2026
  • That assumption is shaky, at best, and could prove very costly.
    — Judd Devermont, semafor.com, 27 Apr. 2026
  • Now, those assumptions are starting to feel less fixed.
    — Ines Fahmi, New York Daily News, 8 May 2026
  • But in many cases, assumptions can lead us astray.
    — Alexa Mikhail, Flow Space, 5 Nov. 2025
  • But that assumption skips the part that matters.
    — Jonathan Hunt, Fortune, 11 Apr. 2026
  • For decades, that assumption appeared to hold up.
    — George Calhoun, Forbes.com, 28 Aug. 2025
  • Yeah, so don’t start with stereotypes, don’t start with assumptions.
    — Harvard Business Review, 30 Dec. 2025

Some of these examples are programmatically compiled from various online sources to illustrate current usage of the word 'assumption.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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