check in checkhook • check-in · · · Info · Definitions · Synonyms · Antonyms · Characters · · check in · · Text Common · · Latin · · Scripts 8 · · Length 2 · · Syllables Definitions · · · (noun) the act of reporting your presence (as at an airport or a hotel). Synonyms: check-in. · · Noun Definition 1 (verb) announce one's arrival, e.g. at hotels or airports. Synonyms: check in, sign in. · · Verb Definition 1 Synonyms · · · sign in · · Synonym 1 Antonyms · · · check out · · Antonym 0 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 k latin small letter k U+006B n latin small letter n U+006E