misassumption

noun mis·as·sump·tion \ ˌmis-ə-ˈsəm(p)-shən \

Definition of misassumption

plural misassumptions
: something that is incorrectly assumed to be granted or true : a mistaken assumption
  • I shudder to think of how much margarine I ate growing up on the misassumption that it was somehow healthier.
  • —Richard T. Bosshardt

misassume

play \ˌmis-ə-ˈsüm\ transitive verb misassumed; misassuming
    • … a lot of boys get shunted into programs that misassume what they can and can't do …
    • —Richard Whitmire

First Known Use of misassumption

1860

in the meaning defined above

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