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tria juncta in uno
Triads of the Welsh bards
Triaenodon obseus
Triaenops Persicus

Triad definitions

Webster's 1828 Dictionary

TRI'AD, n. [L. trias, from tres, three.] The union of three; three united. In music, the common chord or harmony, consisting of the third, fifth and eighth.

WordNet (r) 3.0 (2005)

1: the cardinal number that is the sum of one and one and one [syn: three, 3, III, trio, threesome, tierce, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce- ace]
2: a set of three similar things considered as a unit [syn: trio, triad, triplet, triple]
3: three people considered as a unit [syn: trio, threesome, triad, trinity]
4: a three-note major or minor chord; a note and its third and fifth tones [syn: common chord, triad]

Merriam Webster's

noun Etymology: Latin triad-, trias, from Greek, from treis three Date: 1546 1. 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 triadic adjective triadically adverb

Oxford Reference Dictionary

n. 1 a group of three (esp. notes in a chord). 2 the number three. 3 a Chinese secret society, usu. criminal. 4 a Welsh form of literary composition with an arrangement in groups of three. Derivatives: triadic adj. triadically adv. Etymology: F triade or LL trias triad- f. Gk trias -ados f. treis three

Webster's 1913 Dictionary

Triad Tri"ad, n. [L. trias, -adis, Gr. ?, ?, fr.?, ?, three: cf. F. triade. See Three, and cf. Trias, Trio.] 1. A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities. 2. (Mus.) (a) A chord of three notes. (b) The common chord, consisting of a tone with its third and fifth, with or without the octave. 3. (Chem.) An element or radical whose valence is three. Triads of the Welsh bards, poetical histories, in which the facts recorded are grouped by threes, three things or circumstances of a kind being mentioned together. Hindu triad. See Trimurti.

Collin's Cobuild Dictionary

(triads) Note: The spelling 'Triad' is also used for meaning 1. 1. The Triads were Chinese secret societies in old China that were often associated with organized crime. N-COUNT: usu pl, oft N n 2. A triad is a group of three similar things. (FORMAL) For the faculty, there exists the triad of responsibilities: teaching, research, and service. N-COUNT: oft N of n

Moby Thesaurus

arpeggio, broken chord, chord, clover, common chord, concento, concord, consonant chord, deuce-ace, diminished seventh chord, dominant chord, enharmonic, leash, major triad, minor chord, set of three, seventh chord, shamrock, sixth chord, tercet, ternary, ternion, terzetto, three, threesome, tierce, tonic triad, trefoil, trey, trialogue, triangle, tricorn, trident, triennium, trihedron, trilogy, trimester, trine, trinity, trinomial, trio, triphthong, triple, triple crown, triple threat, triplet, triplopy, tripod, triptych, trireme, triseme, triskelion, trisul, triumvirate, triune, triunity, trivet, troika, unbroken chord

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