Meaning : An undergraduate student during the year preceding graduation.
Meaning : A person who is older than you are.
Synonyms : elder
Meaning : Older. Higher in rank. Longer in length of tenure or service.
Example :
Senior officer.
Younger. Lower in rank. Shorter in length of tenure or service.
juniorMeaning : Used of the fourth and final year in United States high school or college.
Example :
The senior prom.
Synonyms : fourth-year