Webster's English Dictionary

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triad

Cross references:
  1. common chord          
 
tri.ad \'tri--.ad, -*d\ \tri--'ad-ik\ \-i-k(*-)le-\ n [L triad-, trias, fr. 
   Gk, fr. treis three] 1: a union or group of three esp. of three closely 
   related persons, beings,  or things : TRINITY 2: a chord of three tones 
   consisting of a root with its third and fifth and  constituting the 
   harmonic basis of tonal music - tri.ad.ic aj