A2 something that is known to have happened or to exist, especially something for which proof exists, or about which there is information: No decision will be made till we know all the facts. I don't know all the facts about the case. I'm not angry that you took my car - it's just the fact that you didn't ask me first. He knew for a fact that Natalie was lying. It's sometimes hard to separate fact from fiction.Reality and truth as a matter of fact B1 (also in (actual) fact) › used to add emphasis to what you are saying, or to show that it is the opposite of or different from what went before: I don't work. In fact, I've never had a job. "Have you always lived here?" "As a matter of fact (= the truth is) I've only lived here for the last three years."True, real, false, and unreal a fact of life › something unpleasant that cannot be avoided: Going bald is just a fact of life.Reality and truth facts and figures › exact detailed information: We are getting some facts and figures together and we will then have a full board meeting.Information and messages the facts of life › details about sexual activity and the way that babies are bornSexual activity in generalPhysical and sexual assault and abduction