Etymology: translation of German wahrheitsfunktion
: a sentential or propositional function whose truth-value depends only on the truth-values of its arguments
* * *
—truth-functional, adj. —truth-functionally, adv.
/troohth"fungk'sheuhn/, n. Logic.
a statement so constructed from other statements that its truth-value depends on the truth-values of the other statements rather than on their meanings.
Useful english dictionary. 2012.