say it: SEE-nyur
senior is an adjective and noun meaning "older; higher in rank; longer in length of tenure or service". It carries 5 recorded senses.
used of the fourth and final year in United States high school or college
“the senior prom”
an undergraduate student during the year preceding graduation
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for senior come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.