Base is a unit of length equal to 90 feet, 30 yards, 27.432 meters, or 1⁄4 of a domadom, which is the distance between the bases on the baseball diamond where a player must run on the path between the bases. The straight line distance from home to first is 90 feet, but from home to second is about 127 feet and the runner path from home to second is 180 feet. The unit base can be used for the length or distance in general outside of baseball, such as for example, the distance between the back door of one's home and the back door of another home behind their home maybe about two bases.