/ Thesaurus / A Synonyms of assay mark Find synonyms for: Noun1. authentication, hallmark, assay-mark, marker, marking, markusage: a mark on an article of trade to indicate its origin and authenticityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language