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Senior Short Form
The senior short form is Sr. The meaning of senior is elder and it used in many ways as it used as the suffix for the elders who are in the same categories or family. Someone senior in school than students in the lower class but that senior will be junior in college because his category is changed. It can also be used as a surname and also for the people who are older in age or experience.
Senior is also used as a authoritative position for number of years of services or experience.