Baseball Units is a term used to refer to the different measurements of time and distance used in the game of baseball. The most common unit is INNINGS, which is a seven-letter word that refers to the period of play in which each team has one turn batting and one turn fielding. An inning consists of two halves, with each team having one turn at bat in each half. During an inning, each team has three outs, or chances to get the opposing team out. After three outs, the teams switch roles and the other team gets a chance to bat.