The crossword solution for the term CALENDAR SPAN is YEAR, which is a four-letter word. A calendar span is the amount of time that a calendar covers, usually one year. The calendar year is divided into 12 months, each with its own set of days and weeks. The calendar year is also divided into four seasons, spring, summer, fall, and winter. The calendar year is used to measure the passage of time and to keep track of important dates and events.