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This paper proposes that fairness in wireless networks should be measured using one of the following new measures: the deterministic unfairness bound called the wireless absolute fairness bound (WAFB) or the statistical unfairness bound called the 99-percentile wireless absolute fairness bound (WAFB99). Compared with previous fairness definitions, the new fairness measures are better suited for measuring fairness of scheduling disciplines that exploit multiuser diversity. A new scheduling discipline called opportunistic proportional fair scheduling is defined. Numerical results show that the new scheduling discipline has slightly higher throughput and slightly better fairness than proportional fair scheduling.