To suppose to be the case, without proof.
I [assume] you're coming to the party unless you tell me otherwise.
Let's [assume] for a moment that he is telling the truth.
Never [assume] anything without checking the facts.
To suppose that something is the case on the basis of probability.
Since he has a ticket, I [presume] he will be at the concert.
In the U.S., a defendant is [presume]d innocent until proven guilty.
I don't want to [presume], but I think you've made a mistake.
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