A list of times of departures and arrivals; a timetable: a bus schedule; a schedule of guided tours. A plan for performing work or achieving an objective, specifying the order and allotted time for each part: finished the project on schedule. A printed or written list of items in tabular form: a schedule of postal rates. A program of events or appointments expected in a given time: Can you fit me into your schedule Tuesday afternoon? A student's program of classes. A supplemental statement of details appended to a document. A federally regulated list of controlled substances, ranked in classes by potential for abuse. One of the ranks or classes in such a list. To enter on a schedule: calculate and schedule each tax deduction on the proper form. To make up a schedule for: I haven't scheduled the coming week yet. To plan or appoint for a certain time or date: scheduled a trip in June; was scheduled to arrive Monday. To list or rank (a controlled substance) in a schedule.