The noun fact has 4 senses (first 4 from tagged texts)
1. (415) fact -- (a piece of information about circumstances that exist or events that have occurred; "first you must collect all the facts of the case")
2. (91) fact -- (a statement or assertion of verified information about something that is the case or has happened; "he supported his argument with an impressive array of facts")
3. (30) fact -- (an event known to have happened or something known to have existed; "your fears have no basis in fact"; "how much of the story is fact and how much fiction is hard to tell")
4. (27) fact -- (a concept whose truth can be proved; "scientific hypotheses are not facts")