Definition of Triad

1. Noun. The cardinal number that is the sum of one and one and one.

2. Noun. A set of three similar things considered as a unit.
Exact synonyms: Trio, Triple, Triplet
Specialized synonyms: Trilogy, Trigon, Triplicity
Specialized synonyms: Trimurti
Generic synonyms: Set

3. Noun. Three people considered as a unit.
Exact synonyms: Threesome, Trinity, Trio
Generic synonyms: Assemblage, Gathering
Specialized synonyms: Triumvirate

4. Noun. A three-note major or minor chord; a note and its third and fifth tones.
Exact synonyms: Common Chord
Generic synonyms: Chord

Definition of Triad

1. n. A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.

Definition of Triad

1. Noun. A grouping of three ¹

2. Noun. (music) A chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale. ¹

3. Noun. (electronics) on a CRT display, A group of three neighbouring phosphor dots, coloured green, red, and blue. ¹

4. Noun. A collective term that describes many branches of the underground society based in Hong Kong. ¹

¹ Source:

Definition of Triad

1. a group of three [n -S]

Medical Definition of Triad

1. The junction between the T tubules and the sarcoplasmic reticulum in striated muscle. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Triad

triacontanoic acid
triacyl glycerols
triad (current term)
triadic symbiosis

Literary usage of Triad

Below you will find example usage of this term as found in modern and/or classical literature:

1. Music Notation and Terminology by Karl Wilson Gehrkens (1914)
"The simplest chord is the triad, which consists of a fundamental tone ... A major triad has a major third and a perfect fifth, iey it is a major third with ..."

2. The Philosophy of Music: Being the Substance of a Course of Lectures by William Pole (1895)
"We have seen that the diminished triad is formed or two minor thirds. There is another analogous triad, ~"T/ M formed of two major thirds, thus— frtr—feH ..."

3. Aural Harmony by Franklin Whitman Robinson (1918)
"The I triad is the key-tone triad and is the rest chord. The most active triad is the triad on the fifth degree, called the V triad, or dominant triad, ..."

4. The Nature of Harmony and Metre by Moritz Hauptmann (1888)
"But to a higher unit notion than that of the key itself, it can never come ; no more, indeed, than the triad can receive any addition in itself. ..."

5. The Material Used in Musical Composition: A System of Harmony Designed by Percy Goetschius (1913)
"THE TONIC triad, I. 71. This is the fundamental representative of the tonic class of chords. ... This appears in no other triad but the III, in which it is ..."

6. Manners and Customs of the Ancient Egyptians, by John Gardner Wilkinson (1841)
"The third member of a triad, as might be supposed, was not of equal rank with the two from whom it proceeded; and we therefore ..."

7. Cumulative Harmony by William Johnston McCoy (1916)
"55 5th triad (6) (c) At (a) the combined third and fifth form the triad of C; ... 5th major triad 1— At (a) a combination of the major third DF# and a ..."

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