An appointment calendar is a tool that helps you keep track of your appointments, meetings, and tasks, and it is an invaluable tool for managing your time. However, there are plenty of synonyms that you can use to refer to this tool, depending on your preference or the context. Some of the most common synonyms for appointment calendar include planner, agenda, diary, schedule, timekeeper, organizer, timetable, daybook, and calendar book. Regardless of what you choose to call it, the purpose of an appointment calendar remains the same-to help you stay organized, on schedule, and efficient. So whether you prefer a digital calendar or a physical notebook, make sure you use the right tool to optimize your productivity.