• noun
    (written as UNISON)
    the UK’s largest trade union (over 1.3 million members), representing people working in public services and utilities. It was formed in 1993 when three major public sector unions, National Association of Local government Officers (NALGO), National union of Public Employees (NUPE) and confederation of Health Service Employers (COHSE), merged.

Origin & History of “unison”

Unison originated as a musical term, denoting ‘of the same sound’. It comes via Old French unison from late Latin ūnisonus, a compound adjective formed from ūnus ‘one’ and sonus ‘sound’ (source of English sound). The metaphorical sense ‘agreement, concord’ emerged in the 17th century.