Sundaynoun [ C ]uk /ˈsʌn.deɪ/ us /ˈsʌn.deɪ/ written abbreviation Sun.
They go to church on Sundays.
I haven't done any exercise since last Sunday.
New Year's Day this year is a Sunday.
(Definition of “Sunday” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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