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on

preposition (TIME)
 
 
/ɒn/ US  /ɑːn/

Definition

A1 used to show when something happens: Many shops don't open on Sundays. What are you doing on Friday? My birthday's on 30 May. Would you mind telling me what you were doing on the afternoon of Friday the 13th of March? Trains to London leave on the hour (= at exactly one o'clock, two o'clock, etc.). On a clear day you can see the mountains from here. She was dead on arrival (= dead when she arrived) at the hospital. Please hand in your keys at reception on your departure from (= when you leave) the hotel.Describing when something happened or will happen
(Definition of on preposition (TIME) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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