to think that something is true, even with no proof
I assume you are both familiar with this plan.
Please do not assume that I am available to work on weekends without discussing it with me first.
It is unwise to assume that everyone shares the same opinion without seeking their input and feedback.
She made the mistake of assuming the email had been sent when it was still in her drafts folder.
Let's not assume that the outcome will be negative before we even attempt the task.
