Etymology
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hallmark (n.)

1721, official stamp of purity in gold and silver articles, from Goldsmiths' Hall in London, site of the assay office; see hall + mark (n.1). General sense of "mark of quality" first recorded 1864. As a verb from 1773.

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Definitions of hallmark

hallmark (n.)
a distinctive characteristic or attribute;
Synonyms: trademark / earmark / stylemark
hallmark (n.)
a mark on an article of trade to indicate its origin and authenticity;
Synonyms: authentication / assay-mark
From wordnet.princeton.edu