Suppose vs. Assume

synonyms

Both verbs refer to considering something as true, but they have a subtle difference with regards to the consequences of this belief. Follow the lesson for more

To 'suppose' something means to think or believe that it is true, although acknowledging that it might not be. To 'assume' something, however, means to think or believe that something is true and act upon it. This lesson will clarify the difference between these two verbs.

Difference

'Suppose' can be used to express a thought or belief in that something is true, even if it lacks absolute certainty and although you acknowledge that it may not be true. To 'assume' also involves accepting something as true or valid without evidence or proof and acting upon it. It refers to forming a belief or making a presumption, sometimes falsely, based on incomplete information, speculation, or personal judgment and taking it for granted.

I suppose he'll agree to the modified plan.

I assumed he must be out running errands at this hour.

Similarity

Both 'suppose' and 'assume' can be used to introduce a hypothetical situation to talk about the consequences of that hypothetical situation coming true or talk about plans made based on the idea that the hypothetical situation is or will be true. Here are some examples:

Suppose you wake up tomorrow with a million dollars in your bank account. What would you do?

Let us assume that I pass all my exams, then I can go on a trip with my friends.

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