There are 2 definitions of check in in English:

check in1

Arrive and register at a hotel or airport: you must check in at least one hour before take-off
More example sentences
  • He then led us to a very nice hotel where we were checked in and shown to our rooms.
  • We stopped at the main desk of the dingy motel and waited while Jimmy registered and checked us in.
  • Sarah, one of the delightful reception staff, will check you in and whisk you off by hotel buggy to your room.
See parent entry: check

Definition of check in in:

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Word of the day impudicity
Pronunciation: ˌɪmpjʊˈdɪsɪti
noun
lack of modesty

There are 2 definitions of check in in English:

check-in2

Syllabification: check-in

noun

[often as modifier]
1The act of reporting one’s presence and registering, typically at an airport or hotel: the check-in counter
More example sentences
  • At Heathrow, passengers queued outside terminals just to join check-in lines but the airport expects to return to its usual schedule by tomorrow.
  • Airlines often assume that some passengers will miss check-in times, and so overbooking of flights is not uncommon.
  • Now, airlines are reaching the same point with check-in kiosks in airports.
1.1The point at which registration at airport or hotel takes place.
More example sentences
  • In addition to more space and fewer companions, some carriers offer limousine or helicopter service to and from airports and separate check-ins speed the process.
  • Instead, passengers will need to pick up a boarding pass at ticket counters, curbside check-ins, self-service ticket kiosks or by checking in and printing out passes from airline Web sites.
  • It's happening at grocery store checkout counters, movie theater ticket purchases and airline check-ins.

Definition of check in in: