se·nior·i·ty /sinˈjɔrəti, ˈjɑr-/
  長輩,前任者的特權,老資格
  seniority
  前輩; 高位數
  Sen·ior·i·ty n. The quality or state of being senior.
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  seniority
       n 1: higher rank than that of others especially by reason of
            longer service [syn: senior status, higher status, higher
            rank]
       2: the property of being long-lived [syn: longevity]