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English definition of “senior”

senior

noun (OLDER)    /ˈsiː.ni.ər/ US  /-njɚ/
20, 30, etc. years sb's senior 20, 30, etc. years older than someone: She married a man 20 years her senior. She's my senior by three years (= she is three years older than me).Describing age and birthdays [C] mainly US an old person; a senior citizen: Seniors are entitled to a reduction of around 10%. [C] US a student in their final year of high school or universityStudents and pupils
(Definition of senior noun (OLDER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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