Definitions from Wiktionary ( )

▸ noun:  (British, labor union) A public-sector trade union in the United Kingdom.
▸ noun:  (music, acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves).
▸ noun:  (music, acoustics) A sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string.
▸ noun:  The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation.
▸ noun:  (by extension) Two or more voices speaking or singing the same words together.

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