noun
1. higher rank than that of others especially by reason of longer service (Freq. 1)
• Syn: ↑senior status, ↑higher status, ↑higher rank
• Derivationally related forms: ↑senior
• Hypernyms: ↑high status
2. the property of being long-lived
• Syn: ↑longevity
• Derivationally related forms: ↑senior
• Hypernyms: ↑oldness
Useful english dictionary. 2012.