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English definition of “senior”

senior

noun     /ˈsiːniər/
be 20/30, etc years sb's senior to be 20, 30, etc years older than someone: She married a man 20 years her senior.Describing age and birthdays
[C] US a student in their last year of study at an American college or high school (= school for students aged 15 to 18)Students and pupils
(Definition of senior noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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