2 noun
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.
2 especially American English a senior citizen:
Seniors can get a 10% discount.

be two/five/ten etc years somebody's senior

to be two, five, ten etc years older than someone:
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.

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