Pronunciation: (hôl'märk"),[key] —n. 1. 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.
2. any mark or special indication of genuineness, good quality, etc.
3. any distinguishing feature or characteristic: Accuracy is a hallmark of good scholarship.
—v.t. to stamp or imprint (something) with a hallmark.