Definition of senior citizen noun from the Oxford Advanced Learner's Dictionary

 

senior citizen

 noun
noun
BrE
 
; NAmE
 
(also senior especially in North American English) Belonging to society, Old age
 
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an older person, especially somebody who has retired from work. People often call somebody a senior citizen to avoid saying that they are old or using the expression old-age pensioner. See related entries: Belonging to society, Old age
See the Oxford Advanced American Dictionary entry: senior citizen