The term 'CLASS DAY DIVISION' can be broken down into three parts: 'Class Day, ' 'DIVISION, ' and 'PERIOD' (6 letters). Class Day is a day of the school year when classes are held, usually at the end of the semester. DIVISION is the act of separating or dividing something into parts. PERIOD is a length of time during which something occurs or is expected to occur. Together, these three words refer to a specific PERIOD of time during which classes are held and divided into parts.