Topic: SCHOOL
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senior2 [countable]
1 American EnglishSESSEC a student in their last year of high school or university [↪ freshman, junior, sophomore]: 
Jen will be a senior this year.
Jen will be a senior this year.2 especially American English a senior citizen : Seniors can get a 10% discount.
Seniors can get a 10% discount.3 to be two, five, ten etc years older than someone : Her husband was nine years her senior.
be two/five/ten etc years somebody's senior
Her husband was nine years her senior.4 British English an adult or a person who has reached an advanced level in a particular sport [↪ junior]: Juniors and seniors train together on Wednesdays.
Juniors and seniors train together on Wednesdays.