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1 to be two, five, ten etc years younger than someone : 
She married a man seven years her junior.
be two/five/ten etc years somebody's junior
alsobe somebody's junior by two/five/ten etc years
written
She married a man seven years her junior.2 [countable] a young person who takes part in sport for people below a particular age : The juniors use the courts on Tuesday night.
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
an office junior4 [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 a name used humorously when speaking to or about a boy or a younger man, especially your son : Where's Junior?
Junior
American English spokenWhere's Junior?