<p><strong>Noun</strong></p><ul><li>an official mark or stamp indicating a standard of purity, used in marking gold and silver articles assayed by the Goldsmiths' Company of London; plate mark.</li><li>any mark or special indication of genuineness, good quality, etc.</li><li>any distinguishing feature or characteristic: Accuracy is a hallmark of good scholarship.</li></ul><p><strong>Verb</strong></p><ul><li>to stamp or imprint (something) with a hallmark.</li></ul>