Both verbs can describe accepting something as true before it is certain.

The idea

Assume often emphasizes taking something for granted; presume often suggests some grounds. Their meanings overlap.

Patterns to compare
VerbTypical emphasis
assumetake something as true, possibly without evidence
presumesuppose something is true, often on reasonable grounds

Examples

  • I assumed the café was open, but I had not checked its hours.
  • Without asking, Maya assumed that everyone wanted tea.
  • For the calculation, assume that the road is completely flat.
  • The lights were off, so we presumed the office had closed.
  • Given the fresh footprints, the ranger presumed someone had passed recently.
  • Since the parcel had a return label, Leo presumed it could be sent back.

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Watch out

Do not treat presume as proof: a reasonable supposition can still be wrong.

Try it yourself

  1. Choose the correct word or words. After the director left, Sam agreed to ___ responsibility for the project. (assume / presume)

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    assume

    assume: Taking responsibility is the established expression here.

  2. Choose the correct word or words. I would not ___ to tell a skilled chef how to season the soup. (assume / presume)

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    presume

    presume: The construction means daring to do something without the right.

  3. Choose the correct word or words. The train is usually punctual, so we can ___ it will arrive on time, though we cannot be certain. (assume / presume)

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    assume / presume

    assume / presume: The train’s usual punctuality supports the belief, and either verb works.

Use it today

Describe an unchecked belief and another based on a clue.