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Definition
senior1   Show phonetics
adjective
1 MORE IMPORTANT having a more important job or position than someone else
a senior officer/executive
We work in the same team but she's senior to me.

2 OLDER older
senior students

3 NAME MAINLY US (WRITTEN ABBREVIATION Sr) used at the end of a man's name to show that he is the older of two men in the same family who have the same name
Hello, may I speak to Ken Griffey Senior, please?

The first and last word in dictionaries