Something actual as opposed to invented. / Something which is real. / Something concrete used as a basis for further interpretation.

Used before making a statement to introduce it as a trustworthy one.

plural of fact

(Internet slang) Used to express agreement.

(law) Resulting from the actions of parties. / (modal) Actually, in truth.

(UK) Initialism of Federation Against Copyright Theft. / (US) Initialism of Federation of American Consumers and Travelers.

(idiomatic) actually, in truth

factually accurate

(idiomatic) Without doubt. / Used other than figuratively or idiomatically: see for, a, fact.

The condition of being factful