The act of reporting one's presence and registering, typically at an airport or hotel.
What time do we have to be at the check-in?
At the airport, passengers are required to check in at least two hours before the scheduled departure time.
The hotel's policy requires guests to check in at the front desk upon arrival to complete the registration process.
Online check-in allows travelers to skip the airport queue and proceed directly to the security checkpoint.
The conference participants were instructed to check in at the registration booth to receive their conference materials.
