/ Dictionary / Index C check-in: Meaning and Definition of Find definitions for: check-in Pronunciation: (chek'in"), [key] — n. the act or fact of checking in. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: check-in (Thesaurus) checkhook checking account Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language