Meaning of TRIAD in English
noun a chord of three notes.
2. triad ·noun an element or radical whose valence is three.
3. triad ·noun the common chord, consisting of a tone with its third and fifth, with or without the octave.
4. triad ·noun a union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.
Webster English vocab. Английский словарь Webster. 2012