check in Meaning in the Cambridge English Dictionary
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Meaning of “check in” in the English Dictionary

"check in" in British English

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check in

phrasal verb with check uk   us   /tʃek/ verb
B1 to show ​yourticket at an ​airport so that you can be told where you will be ​sitting and so that ​yourbags can be put on the ​aircraft: Passengers are ​requested to ​check in two ​hours before the ​flight. You can ​savetime by ​checking on ​online.
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check-innoun [C]

uk   us   /ˈtʃek.ɪn/
B1 the ​area at an ​airport where you show ​yourticket so that you can be told where you will be ​sitting: A ​representative from the ​tourcompany will ​meet you at the check-in.B1 the ​act of ​showingyourticket at an ​airport so that you can be told where you will be ​sitting: After check-in, ​pleaseproceed to ​gate 26.
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(Definition of check in from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"check in" in American English

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check in

phrasal verb with check  us   /tʃek/ verb
to ​reportyourarrival, esp. at an ​airport or ​hotel, so that you can get the ​service you are ​paying for: Be ​sure to check in at least an ​hour before ​yourflight.

check-innoun [U]

 us   /ˈtʃekˌɪn/
the ​act of ​recordingyourarrival at a ​hotel or at an ​airport when you are going to ​travel: The ​airline also ​offersonline check-in.
(Definition of check in from the Cambridge Academic Content Dictionary © Cambridge University Press)

"check-in" in Business English

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check-innoun

uk   us   /ˈtʃekɪn/ TRANSPORT
[C] (also check-in desk) the ​place where you go when you arrive at an ​airport, ​port, etc., and where you show your ​ticket before you get on the ​plane, boat, etc.: A ​representative from the ​tourcompany will ​meet you at the check-in.
[U] the ​process of showing your ​ticket, etc. when you arrive at an ​airport , ​port, etc., or of giving your ​name when you arrive at a ​hotel: Check-in for this ​flight is at ​desks 30 - 35. Check-in at the ​hotel is usually from 4 p.m., but earlier check-in ​times can be ​arranged on ​request.
[U] INTERNET the ​process of using the ​internet to ​check in for a ​flight: Web check-in ​allows you to ​confirmflights, choose ​seats, and ​print your ​boardingpass.
(Definition of check-in from the Cambridge Business English Dictionary © Cambridge University Press)
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