Definition:Propositional Function/Satisfaction

Definition
Let $P \paren {x_1, x_2, \ldots, x_n}$ be an $n$-ary propositional function.

If $a_1, a_2, \ldots, a_n$ have values which make $P \paren {x_1, x_2, \ldots, x_n}$ true, then the ordered tuple $\paren {a_1, a_2, \ldots, a_n}$ satisfies $P \paren {x_1, x_2, \ldots, x_n}$.