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WordNet
merit pay

n. extra pay awarded to an employee on the basis of merit (especially to school teachers)

Wikipedia
Merit pay

Merit pay is a term that describes performance-related pay, most frequently in the context of educational reform or government civil service reform (government jobs). It provides bonuses for workers who perform their jobs effectively, according to easily measurable criteria. In the United States, policy makers are divided on whether merit pay should be offered to public school teachers, and other public employees, as is commonly the case in the United Kingdom.