How to Say "seniority" in Spanish
The Spanish word for “seniority” is “antigüedad” — B2 level.
English → SpanishB2
nounB2
years of service at a job

Examples
Tengo cinco años de antigüedad en esta empresa.
I have five years of seniority at this company.
Los ascensos se deciden por antigüedad.
Promotions are decided by seniority.
Using 'de'
When talking about years at a job, we use the pattern: [Number] años de antigüedad.
Related Translations
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