Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun hallmark

2 senses of hallmark

Sense 1
hallmark, trademark, earmark, stylemark -- (a distinctive characteristic or attribute)
       => characteristic -- (a distinguishing quality)

Sense 2
authentication, hallmark, assay-mark -- (a mark on an article of trade to indicate its origin and authenticity)
       => marker, marking, mark -- (a distinguishing symbol; "the owner's mark was on all the sheep")