The Industrial Disputes Act, 1947 defines a 'workman' as any person employed in an industry, covering skilled, unskilled, manual, supervisory, technical, or clerical work, with certain exceptions for managerial roles and specific wage thresholds. Key criteria for workman status include an employer-employee relationship, engagement in an industry, and performing work for hire or reward. Additionally, the determination of workman status may depend on the predominant nature of the work the individual performs.