Workman definition depends on principal duties performed, not job title; claimant must prove workman status. The statutory definition of Workman hinges on the nature of employment and the principal duties performed, not job title. The definition covers persons doing manual, skilled, technical, operational, clerical or supervisory work for hire and extends to those dismissed or retrenched in connection with industrial disputes, while excluding armed forces, police, prison employees, persons in managerial or administrative capacities, and supervisors who either earn above a prescribed wage threshold or exercise mainly managerial functions. The claimant bears the burden of proving workman status.