junior | (adjective) younger; lower in rank; shorter in length of tenure or service | - |
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(adjective) used of the third or next to final year in United States high school or college | Synonyms: next-to-last, third-year |
(adjective) including or intended for youthful persons | - |
senior | (adjective) older; higher in rank; longer in length of tenure or service | - |
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(adjective) used of the fourth and final year in United States high school or college | Synonyms: fourth-year |
(adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, older |