The act of checking in at a hotel, airport, etc. / (computing) The submission of source code or other material to a source control repository.

To announce or record one's own arrival at a hotel, airport etc. / To verify a person's information and record their arrival, such as at a hotel, airport, etc.

simple past tense and past participle of check in

Under restraint or control.

(transitive) To formally announce one's arrival at a location or event (usually a hotel) to a proprietor or employee of that location or event in order to secure admission, accommodations, or other services.

An aircraft maintenance check performed approximately every 500-800 flight hours or 200-400 cycles.

A surname.

(transitive) To personally verify that (someone or something) is safe, copacetic, appropriate or satisfactory.

plural of check

Third-person singular simple present indicative form of check