9 letters · 16 points in Scrabble
adjective of a proposition; necessarily true or logically certain
originFrom the Latin apodīcticus (“proving clearly”, “demonstrative”), from the Ancient Greek ἀποδεικτικός (apodeiktikós, “affording proof”, “demonstrative”), from ἀποδείκνυμι (apodeíknumi, “to demonstrate”). In turn, from ἀπο- (apo-, “separate, without”), and δεικτικός (deiktikós, “capable of proof”).
Etymology from Wiktionary, CC BY-SA 3.0