A journal is, at its root, a daily thing. The word traces straight back to Latin dies ('day'), through diurnus ('daily') and its Late Latin extension diurnalis. Old French compressed this into jornal, meaning 'daily' or 'a day's portion of work', and English borrowed it in the 14th century for a book of daily financial records. The accounting sense came first. Medieval merchants kept journals as day-books — chronological ledgers where each transaction was recorded under its date before being transferred to a more permanent account book. This bookkeeping meaning survives in modern accounting terminology. The personal diary sense emerged in the 17th century, while the scholarly periodical sense followed in the 18th. The word journalist appeared in the late 17th century, originally meaning someone who kept a journal, before narrowing to its modern press meaning. What makes journal's etymology satisfying is the hidden family it belongs to. Journey (a day's travel), adjourn (postpone to another day), and diurnal (occurring daily) all share the same Latin root. The daily rhythm that once organised all these words has largely been forgotten, but it still beats quietly inside each one.