daybook /ˈdeɪˌbʊk/ noun3 •A daily chronicle; a diary.I try to get up thirty minutes before anyone else in my house in order to have my daybook writing time. — 2001 •An accounting journal.Since these memoranda were marked down from day to day and the entries followed one another day by day, this first book of accounts was called a "daybook." — 1920 •A logbook. formsdaybooks