pos·it / ˈpäzit/ • v. (pos·it·ed, pos·it·ing) 1. [tr.] assume as a fact; put forward as a basis of argument: the Confucian view posits a perfectible human nature | he posited that the world economy is a system with its own particular equilibrium. ∎ (posit something on) base something on the truth of (a particular assumption): these plots are posited on a false premise about women's nature as inferior.2. [tr.] put in position; place: the professor posits Cohen in his second category of poets.• n. Philos. a statement that is made on the assumption that it will prove to be true.