(now chiefly US) An old person. / Someone older than someone else (with possessive). / Someone seen as deserving respect or reverence because of their age.

Older; superior / Higher in rank, dignity, or office. / (US) Of or pertaining to a student's final academic year at a high school (twelfth grade) or university.

plural of seniority

(US, Canada) A tendency of seniors in high school or college to skip class or slack off due to a desire to move on, or because they have already been accepted by a college and their further academic performance is no longer as relevant.

A surname.

plural of senior

A measure of the amount of time a person has been a member of an organization, as compared to other members, and with an eye towards awarding privileges to those who have been members longer.

Third-person singular simple present indicative form of seniorize

simple past tense and past participle of seniorize

(rare, transitive, intransitive) To make or become senior. / (obsolete, intransitive) To exercise authority; to rule; to lord it.