defining - definition and synonyms

adjective [always before noun] 

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/dɪˈfaɪnɪŋ/
  1. 1
    a defining event or moment is one that decides everything that happens afterwards

    We are at a defining moment in our history.

  2. 2
    a defining feature or characteristic is one that is completely typical of something and allows it to be identified

    Tagging is one of the defining characteristics of Web 2.0 services.