Crossword clue: additional proof that something that was believed (some fact or hypothesis or theory) is correct

The most common answer is confirmation (12 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

confirmation 12 letters wn-def

additional proof that something that was believed (some fact or hypothesis or theory) is correct

verification 12 letters wn-def

additional proof that something that was believed (some fact or hypothesis or theory) is correct