triad - Definitions from Dictionary.com

6 results for: triad

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

tri·ad

Audio Help [trahy-ad, -uh

d] Pronunciation Key

–noun

1.	a group of three, esp. of three closely related persons or things.

Chemistry.

a.	an element, atom, or group having a valence of three. Compare monad (def. 2), dyad (def. 3).

b.	a group of three closely related compounds or elements, as isomers or halides.

3.	Music. a chord of three tones, esp. one consisting of a given tone with its major or minor third and its perfect, augmented, or diminished fifth.

4.	(initial capital letter) Military. the three categories of strategic-nuclear-weapons delivery systems: bombers, land-based missiles, and missile-firing submarines.

[Origin: 1540–50; < L triad- (s. of trias) < Gk triás See tri-, -ad¹

]

—Related forms

tri·ad·ic, adjective

tri·ad·ism, noun

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
triad

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American Heritage Dictionary - Cite This Source - Share This

tri·ad Audio Help (trī'ād', -əd) Pronunciation Key
n.

A group of three.
Music A chord of three tones, especially one built on a given root tone plus a major or minor third and a perfect fifth.
A section of a Pindaric ode consisting of the strophe, antistrophe, and epode.

[Late Latin trias, triad-, from Greek, the number three; see trei- in Indo-European roots.]

tri·ad'ic (trī-ād'ĭk) adj.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
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.

WordNet - Cite This Source - Share This

triad
noun
1.	the cardinal number that is the sum of one and one and one [syn: three]
2.	a set of three similar things considered as a unit [syn: trio]
3.	three people considered as a unit [syn: trio]
4.	a three-note major or minor chord; a note and its third and fifth tones [syn: common chord]

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Triad

Three\, a. [OE. [thorn]re, [thorn]reo, [thorn]ri, AS. [thorn]r[=i], masc., [thorn]re['o], fem. and neut.; akin to OFries. thre, OS. thria, threa, D. drie, G. drei, OHG. dr[=i], Icel. [thorn]r[=i]r, Dan. & Sw. tre, Goth. [thorn]reis, Lith. trys, Ir., Gael. & W. tri, Russ. tri, L. tres, Gr. trei^s, Skr. tri. [root]301. Cf. 3d Drilling, Tern, a., Third, Thirteen, Thirty, Tierce, Trey, Tri-, Triad, Trinity, Tripod.] One more than two; two and one. "I offer thee three things." --2 Sam. xxiv. 12.

Three solemn aisles approach the shrine. --Keble.

Note: Three is often joined with other words, forming compounds signifying divided into, composed of, or containing, three parts, portions, organs, or the like; as, three-branched, three-capsuled, three-celled, three-cleft, three-edged, three-foot, three-footed, three-forked, three-grained, three-headed, three-legged, three-mouthed, three-nooked, three-petaled, three-pronged, three-ribbed, three-seeded, three-stringed, three-toed, and the like.

Acronym Finder - Cite This Source - Share This

TRIAD

TRIAD: in Acronym Finder

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