/seen yawr"i tee, -yor"-/ , n. , pl. seniorities for 2.
1. the state of being senior; priority of birth; superior age.
2. priority, precedence, or status obtained as the result of a person's length of service, as in a profession, trade, company, or union: First choice of vacation time will be given to employees with seniority.
[ 1400-50; late ME senioritas, equiv. to L senior SENIOR + -itas -ITY ]