14 letters · 19 points in Scrabble
noun a mark on an article of trade to indicate its origin and authenticity
noun validating the authenticity of something or someone
originEtymology tree English authenticate Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English authentication From authenticate + -ation.
Etymology from Wiktionary, CC BY-SA 3.0