hallmark - definition and synonyms

noun [countable] 

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/ˈhɔːlˌmɑː(r)k/
singularhallmark
pluralhallmarks
  1. 1
    a typical feature

    She treated us with the friendly professionalism that has become her hallmark.

    have/bear all the hallmarks of something:

    The killings bore all the hallmarks of drug-related murders.

  2. 2
    an official mark on an object made of gold or silver, showing the quality of the metal and when and where the object was made