A trinity is a unit made up of three — like the famous Christian trinity of the Father, the Son, and the Holy Spirit.

The prefix tri — which can also be found in triangle — is a clue that this word has to do with the number three. If three people are in charge of a project together, they could be considered a trinity, and a three-person band could be called a trinity.

Definitions of trinity
  1. noun
    three people considered as a unit
    synonyms: threesome, triad, trio
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    a group of three men responsible for public administration or civil authority
    a modern Russian triumvirate
    type of:
    assemblage, gathering
    a group of persons together in one place
  2. 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, triad, trine, 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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