seniority

Seniority refers to being ranked higher in an organization since you have been there longer. Who has seniority in a high school? The seniors of course!

You know how older people are called senior citizens or seniors? That should help you remember what seniority is: the longer someone stays within an organization, the more they have of it. A new worker has hardly any seniority. Someone working at a job for 20 years has a lot of seniority. Having seniority is like having a higher rank or status.

Definitions of seniority
1

n higher rank than that of others especially by reason of longer service

Synonyms:
higher rank, higher status, senior status
Type of:
high status
a position of superior status

n the property of being long-lived

Synonyms:
longevity
Type of:
oldness
the opposite of youngness

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