To assume is to believe something is true or believe that something is going to happen, but sometimes a belief in present circumstances or the future is incorrect.
Richard assumed that he was going to get promoted to a managerial position at work, but the job was given to someone else.
Everyone in Janet’s family has gone to college, so she assumes that she will do the same.
I assumed my car would be ready by the time I showed up at the garage, and I was correct.
Don’t assume that everything will go as planned.
To assume is also to take on a responsibility or take someone else’s position:
Wendy will assume more responsibility at work now that she’s a supervisor.
Arthur Hessenfender assumed full control of the company after he bought it.
The U.S. military assumed control over certain areas of Germany at the conclusion of World War II.
The word "assumption" is a noun.
It’s not a good idea to make too many assumptions about where you will end up in life.
Joel has made no assumptions about whether or not his girlfriend will agree to marry him.
To believe that you don’t need health insurance because you are healthy and young may turn out to be an incorrect assumption.
False assumptions about the direction of the economy were responsible for a severe recession.
