senior UK /ˈsiːnjə(ɹ)/US /ˈsinjɚ/adjective 5noun 6forms 4 adjective5 •Older. •at a higher level than others at work or in a group •Synonym of elder.It is unusual for the senior hand to leave even one of the five cards to which he is entitled. It indicated an unusually strong hand. — 1923 •(US) Of or pertaining to a student's final academic year at a high school (twelfth grade) or university. •(US, Canada) Of or pertaining to a league or competition limited to players above a certain age or level of experience. noun6 •Someone older than someone else (with possessive).He was four years her senior. •(US) An old person.Grave and reverend seniors seemed to have caught the prevailing spirit as badly as the students, and I saw white-bearded men rising and shaking their fists at the obdurate Professor. — 1912 •Someone seen as deserving respect or reverence because of their age. •(US, Philippines) A final-year student at a high school or university; a finalist. •Somebody who is higher in rank, dignity, or office. •(no longer used) An elder or presbyter in the early Church.Then Peter full of the holy goost sayd vnto them. Ye ruelars of the people / and seniours of israhel[…]. — 1526 formsseniors · more senior · most senior · seniorest