1 also written
to be two, five, ten etc years younger than someone:
She married a man seven years her junior.
a young person who takes part in sport for people below a particular age:
The juniors use the courts on Tuesday night.
3 [countable] especially British English
someone who has a low rank in an organization or profession:
an office junior
4 [countable] British EnglishSES
a child who goes to a junior school
5 [countable] American EnglishSES
a student in the year before the final year of high school or college ➔ freshman, senior2 (1), sophomore
6 American English spoken
a name used humorously when speaking to or about a boy or a younger man, especially your son: