The term SPACE can be defined in many ways, from the six-letter PERIOD to the thirteen-letter final frontier. It can refer to a REGION, a CHASM, CAPACITY, AIR, GAP, AREA, HOLE, ROOM, VOID, CRAWL, OUTER, CADET, REALM, cadets, CAPSULE, breathingroom, and finalfrontier. Each of these words has its own unique meaning when it comes to describing space, whether it is a physical or abstract concept. For example, a PERIOD is a unit of time, while a REGION is an AREA of land or sea. A CHASM is a deep, steep-sided opening in the earth's surface, while CAPACITY is the maximum amount of something that can be contained. AIR is a mixture of gases that surrounds the earth, while a GAP is a break or opening in something. An AREA is a part of a surface, while a HOLE is an opening in a solid object. ROOM is an AREA within a building, while a VOID is an empty space. CRAWL is a slow, low movement, while OUTER is located on the outside. CADET is a student in military training, while a REALM is a kingdom or domain. Cadets are students in military training, while a CAPSULE is a small container. Breathingroom is a space for freedom of movement, while finalfrontier is the furthest point of exploration.