seniority
/ˌsi:nɪˈɔrətɪ; ?@ -ˈɔ:r-; sin`jɔrətɪ/ n[U]
1 being senior in age, rank, etc 年长; 级别高; 资格老
Should promotion be through merit or seniority? 晋升应该凭成绩还是靠年资?
2 extent to which sb is senior 年长、 级别高或资格老的程度
a doctor with five years' seniority over his colleague 比同事多五年资历的医生.