Definition of calendar

The word "calendar" originated from the Latin "calendae," which referred to the first day of the Roman month. The Latin term was derived from "calare," meaning "to call" or "to announce." In ancient Rome, the word "calendae" was used to announce the start of a new month, typically marked by the full moon. As the Roman Empire spread, the concept of a calendar spread along with it. The Latin term "calendae" evolved into Middle English "caldendre," and eventually, the modern English word "calendar." Today, a calendar is a essential tool for keeping track of dates, appointments, and time. Over time, the meaning of the word "calendar" has expanded to include not only a list of days and months but also a visual representation of time, typically in a grid or chart format.