triad

A triad is three things or people considered as one unit. A triad is a trio.

A triangle is a shape with three sides. Similarly, a triad is a set of three things or people. To be a triad, three individual parts must also be considered a unit. A band with three members is a triad. A business with three divisions is a triad. A family with three members is a triad. A book with three volumes is a triad (usually called a trilogy). Triads are also called threesomes and trios.

Definitions of triad
  1. noun
    a set of three similar things considered as a unit
    synonyms: trio, triple, triplet
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    examples:
    Trimurti
    the triad of divinities of later Hinduism
    types:
    trilogy
    a set of three literary or dramatic works related in subject or theme
    trigon, triplicity
    (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees
    type of:
    set
    a group of things of the same kind that belong together and are so used
  2. noun
    three people considered as a unit
    synonyms: threesome, trinity, trio
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    types:
    triumvirate
    a group of three men responsible for public administration or civil authority
    troika
    a modern Russian triumvirate
    type of:
    assemblage, gathering
    a group of persons together in one place
  3. noun
    a three-note major or minor chord; a note and its third and fifth tones
    synonyms: common chord
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    type of:
    chord
    a combination of three or more notes that blend harmoniously when sounded together
  4. noun
    the cardinal number that is the sum of one and one and one
    synonyms: 3, III, deuce-ace, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, trine, trinity, trio, triplet, troika
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    type of:
    digit, figure
    one of the elements that collectively form a system of numeration
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