hallmarks

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Definitions from WordNet

Noun hallmark has 2 senses

hallmark, trademark, earmark, stylemark - a distinctive characteristic or attribute
--₁ is a kind of characteristic
authentication, hallmark, assay-mark - a mark on an article of trade to indicate its origin and authenticity
--₂ is a kind of marker, marking, mark

Definitions from the Web

Hallmarks

Definition:

(noun) Indications or marks of quality, genuineness, or authenticity.

(verb) To stamp with a hallmark; to authenticate or validate.

Senses:

Sense 1:

(noun) Official marks stamped on articles of gold, silver, or platinum, guaranteeing metal quality and purity.

Example: The piece of jewelry had the hallmarks of high-quality silver.

Sense 2:

(noun) Distinctive features or characteristics that signify a particular person, group, or thing.

Example: The picturesque village was a hallmark of traditional English charm.

Sense 3:

(verb) To stamp or imprint with an official mark as a guarantee of genuineness or quality.

Example: The silverware manufacturer hallmarks each piece with their logo to ensure authenticity.