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English definition of “senior”

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senior

adjective uk   /ˈsiː.ni.ər/ us    /-njɚ/

senior adjective (OLDER)

B2 [before noun] older: Senior pupils are expected to set an example to the younger children.
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( UK written abbreviation Snr, US written abbreviation Sr.) used after a man's name to refer to the older of two people in the same family who have the same name: Hello, may I speak to Ken Griffey senior, please?
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senior adjective (HIGH RANK)

B2 high or higher in rank: senior management a senior government minister She's senior to me, so I have to do what she tells me. older and more experienced than the other members of a team: Dragons head coach Lyn Jones praised his senior players in the 23-16 win over Scarlets .
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senior

noun uk   /ˈsiː.ni.ər/ us    /-njɚ/

senior noun (HIGH RANK)

[C] someone who is high or higher in rank: It's important to impress your seniors if you want to be promoted.

senior noun (OLDER)

20, 30, etc. years sb's senior 20, 30, etc. years older than someone: She married a man 20 years her senior. She's my senior by three years (= she is three years older than me). [C] US ( UK senior citizen) an old person: Seniors are entitled to a reduction of around 10%. [C] US a student in their final year of high school or university
(Definition of senior from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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