Assume vs presume in English

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Both are guesses. Assume is weaker (little or no evidence), presume is stronger (reasonable evidence). But how to remember which is which?

Table of contents


Make a guess based on little or no evidence.
Make an informed guess based on reasonable evidence.

Source for the word definitions: Are 'Assume' and 'Presume' Synonyms? on Merriam-Webster.


  • When you ass-ume something, it's just a guess that you have pulled from your ass.
  • When you pre-sume something, you have some pre-knowledge or pre-information to support your guess.

Source for the mnemonics: I pulled them from my ass!


I suppose I should add a third word to the comparison: suppose. Coming soon™.