cal•en•dar n. 1. Any or various systems of showing time divisions by days, weeks, months, and years. 2. A table showing these divisions, usu. for a specific year. 3. A usu. chronological list or schedule. — v. To enter on a calendar.

magic square A magic square consists of the distinct positive integers 1, 2, ..., such that the sum of the n numbers in any horizontal, vertical, or main diagonal line is always the same number known as the magic constant.