"senior" in the noun sense
an undergraduate student during the year preceding graduation
2. elder, senior
a person who is older than you are
"senior" in the adjective sense
older higher in rank longer in length of tenure or service
2. senior, fourth-year
used of the fourth and final year in United States high school or college
"the senior prom"
3. aged, elderly, older, senior
advanced in years (`aged' is pronounced as two syllables
"aged members of the society"
"elderly residents could remember the construction of the first skyscraper"
Source: WordNet® (An amazing lexical database of English)
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