Having seniority is a term used to describe the status of someone who has been in a job or position for a longer period of time than others. It is often associated with having more experience and authority than those who have been in the same job or position for a shorter period of time. The crossword solutions for the term 'having seniority' are 'OLDEST' (6 letters) and 'OLDER' (5 letters). These words refer to the fact that someone who has seniority is usually the OLDEST or OLDER person in the job or position.