12 letters · 20 points in Scrabble
noun additional proof that something that was believed (some fact or hypothesis or theory) is correct
noun (law) an affidavit attached to a statement confirming the truth of that statement
originFrom Middle French verification (modern French vérification) or its etymon Medieval Latin vērificātiō. By surface analysis, verificate + -ion.
Etymology from Wiktionary, CC BY-SA 3.0