Common chord

The familiar name for a major or minor triad (in American usage, only a major triad).

The noun has one meaning:

Meaning #1: a 3-note major or minor chord; a note and its third and fifth tones
  Synonym: triad

The term common chord has several possible meanings:

• Common chord (music) generally refers to a chord shared by two musical keys. Such common chords are useful in modulating from one key to another.

• Common chord (geometry) refers to the secant line that joins the intersection points of two curves. If the two curves are both circles, the common chord is equivalent to the radical axis.

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