fact

(noun) a piece of information about circumstances that exist or events that have occurred. Examples: "First you must collect all the facts of the case."

(noun) a statement or assertion of verified information about something that is the case or has happened. Examples: "He supported his argument with an impressive array of facts."

(noun) an event known to have happened or something known to have existed. Examples: "Your fears have no basis in fact." "How much of the story is fact and how much fiction is hard to tell."

(noun) a concept whose truth can be proved. Examples: "Scientific hypotheses are not facts."