Accepted cause and effect relationships, or estimates of the existence of a fact from the known existence of other fact(s). Although useful in providing basis for action and in creating "what if" scenarios to simulate different realities or possible situations, assumptions are dangerous when accepted as reality without thorough examination. See also critical thinking and rule of thumb.

Use assumptions in a sentence

  • Mary was making assumptions about Sally even though they had just met two minutes ago. Mary was thinking that Sally was a mean person.

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  • When you are making a business decision with limited info you must hope that your assumptions about the future play out.

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  • When people are in doubt or confused about something, they may begin to make inaccurate assumptions that are far from true.

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