junior
adjective
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used of the third or next to final year in United States high school or collegethird-yearnext-to-last
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including or intended for youthful persons“a junior sports league”
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younger
noun
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the younger of two persons“My colleague is several years my junior.”
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a third-year undergraduate
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term of address for a disrespectful and annoying male“look here, junior, it's none of your business”