n. A book giving facts about the year, its chief seasons, festivals, dates, etc., or other kindred subjects: as, Hone's Year-Book.n. A book published every year, every annual issue containing new or additional information; a work published annually and intended to supply fresh information on matters in regard to which changes are continually taking place: as, a parish yearbook.n. One of a number of books containing chronological reports of early cases adjudged or argued in the courts of England.