Triad Group Consisting Noun Treis Chord Tri·Ad Trias

tri·ad
\\ˈtrī-ˌad also -əd\\ noun1. a union or group of three :

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 \\trī-ˈa-dik\\ adjective
• tri·ad·i·cal·ly \\-di-k(ə-)lē\\ adverb

triad
  1546, "group or set of three," from L.L. trias (gen. triadis), from Gk. trias (gen. triados), from treis "three" (see three). Musical sense of "chord of three notes" is from 1801.

triad
triad / 5traiAd / noun1. (formal) a group of seven related people or things
   三人组合；三位一体；三件一套
2. (also Triad) a Chinese secret organization involved in criminal activity
   三合会(中国秘密犯罪组织)

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tri·ad
I. \ˈtrīˌad, -īəd\ noun
(-s)
Etymology: Latin triad-, trias, from Greek; akin to Greek treis three — more at
: a union or group of three especially of three closely related persons, beings, or things :
 < a triad of deities >
 < a triad of symptoms >
as
 a. : a gnomic literature in medieval Wales and Ireland consisting of short aphorisms grouped in threes and in prose marked by rhythm and assonance and applying to various subjects (as history, laws, or morals)
 b. : a trivalent element, atom, or radical
 c. : a chord of three tones consisting of a root with its third and fifth and constituting the harmonic basis of tonal music — called also common chord; see , ; compare ,
 d. : a group of three individuals maintaining a sociologically significant relationship — compare
 e. : a group of three strophes in a classical ode consisting of strophe, antistrophe, and epode
II. adjective
: having symmetry that results in repetition after every 120-degree rotation

 < a triad crystal axis >