seniority
noun [ U ]
uk/ˌsiːniˈɒrəti/ usthe length of time you have worked for an organization, and the advantages that you get from this:
Several people who had 30 years' seniority took the $140,000 lump sum on retiring.
Pay ranges from $23,000 to $110,000 a year, depending on duties and seniority.
the situation of having a higher rank than someone else in an organization:
position of seniority.