Definition of seniority noun from the Oxford Advanced American Dictionary

     

    seniority

     noun
    noun
    NAmE//ˌsinˈyɔrət̮i//
     
    , NAmE//ˌsinˈyɑrət̮i//
     
    [uncountable]
     
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  1. 1the fact of being older or of a higher rank than others a position of seniority
  2. 2the rank that you have in a company because of the length of time you have worked there a lawyer with five years' seniority Should promotion be based on merit or seniority?
See the Oxford Advanced Learner's Dictionary entry: seniority