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senior (adj.)

late 13c., from Latin senior "older," comparative of senex (genitive senis) "old," from PIE root *sen- "old." Original use in English was as an addition to a personal name indicating "the father" when father and son had the same name; meaning "higher in rank, longer in service" first recorded 1510s.

The Latin word yielded titles of respect in many languages, such as French sire, Spanish señor, Portuguese senhor, Italian signor. Also compare Herr. Senior citizen first recorded 1938, American English.

senior (n.)

mid-14c., "person of authority;" late 14c., "person older than another," from senior (adj.). Sense of "fourth-year student" is from 1741, from earlier general sense of "advanced student" (1610s).

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Definitions of senior
1
senior (adj.)
used of the fourth and final year in United States high school or college;
the senior prom
Synonyms: fourth-year
senior (adj.)
older; higher in rank; longer in length of tenure or service;
senior officer
senior (adj.)
advanced in years; (`aged' is pronounced as two syllables);
senior citizen
Synonyms: aged / elderly / older
2
senior (n.)
an undergraduate student during the year preceding graduation;
senior (n.)
a person who is older than you are;
Synonyms: elder
From wordnet.princeton.edu