12 letters · 17 points in Scrabble
verb establish the authenticity of something
originEtymology tree English authentic Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-tós Proto-Indo-European *-eh₂tos Proto-Italic *-ātos Latin -ātuslbor. English -ate English authenticate From authentic + -ate (adjective-forming suffix).
Etymology from Wiktionary, CC BY-SA 3.0