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English definition of “senior citizen”

senior citizen

noun [C]  /ˈsin·jər ˈsɪt̬·ə·zən/ (short form senior) us  
an older person, usually over the age of 60 or 65, esp. one who is no longer employed: Senior citizens get a discount.
(Definition of senior citizen from the Cambridge Academic Content Dictionary © Cambridge University Press)
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