mass layoff
Labor law. Under the Worker Adjustment and Retraining Notification Act, a reduction in force that results in the loss of work at a single site, of 30 days or more, for at least 500 full-time employees, or 50 or more full-time employees if they make up at least 33% of the employees at that site. 29 USCA § 2101(a)(3). See WORKER ADJUSTMENT AND RETRAINING NOTIFICATION ACT. [Cases: Labor Relations 7.1.]