triad

definition: a three-note major or minor chord
example:
speech part: noun
synonyms: common chord
definition: three people considered as a unit
example:
speech part: noun
synonyms: trio threesome trinity
definition: a set of three similar things considered as a unit
example:
speech part: noun
synonyms: triple
definition: the cardinal number that is the sum of one and one and one
example:
speech part: noun
synonyms: leash

How triad is being used?