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English definition of “senior”

senior

adjective (OLDER)    /ˈsiː.ni.ər/ US  /-njɚ/
B2 [before noun] older : Senior pupils are expected to set an example to the younger children . → Compare junior nounDescribing age and birthdays (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 ?Names and titles
(Definition of senior adjective (OLDER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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