Section 2 (kkk) of the Industrial Disputes Act, 1947 defines the term ‘Layoff’’ as the inability, failure, or refusal of the employer to provide employment to a workman whose name is mentioned in the muster roll of his industrial establishment and who is not retrenched due to the lack of power, coal, raw materials, accumulation of stocks, breakdown of machinery or natural calamity for any other relevant reason.