| Noun | 1. | senior - an undergraduate student during the year preceding graduation | |
| 2. | senior - a person who is older than you areadult, grownup - a fully developed person from maturity onward doyen, dean - a man who is the senior member of a group; "he is the dean of foreign correspondents" doyenne - a woman who is the senior member of a group | |
| Adj. | 1. | senior - older; higher in rank; longer in length of tenure or service; "senior officer"old - (used especially of persons) having lived for a relatively long time or attained a specific age; especially not young; often used as a combining form to indicate an age as specified as in `a week-old baby'; "an old man's eagle mind"--William Butler Yeats; "his mother is very old"; "a ripe old age"; "how old are you?" junior - younger; lower in rank; shorter in length of tenure or service | |
| 2. | senior - used of the fourth and final year in United States high school or college; "the senior prom"last - coming after all others in time or space or degree or being the only one remaining; "the last time I saw Paris"; "the last day of the month"; "had the last word"; "waited until the last minute"; "he raised his voice in a last supreme call"; "the last game of the season"; "down to his last nickel" | |
| 3. | 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"; "senior citizen"old - (used especially of persons) having lived for a relatively long time or attained a specific age; especially not young; often used as a combining form to indicate an age as specified as in `a week-old baby'; "an old man's eagle mind"--William Butler Yeats; "his mother is very old"; "a ripe old age"; "how old are you?" | |