1 [count] : a device that is placed inside a machine (such as a clock, toy, or car) to supply it with electricity
▪ I bought new batteries for the flashlights. ▪ a car battery ▪ battery-powered computers ▪ a dead battery = (Brit) a flat battery [=a battery that has no more electricity] — see picture at car 2 [count] : a usually large group of similar people, things, or ideas that work together, are used together, etc.
▪ a battery of tests ▪ The operation was performed by a battery of doctors. 3 [count] : a group of two or more big guns used by the military
▪ an artillery battery 4 [noncount] law : the crime of hitting or touching someone in a way that is meant to cause harm or injury
▪ He was found guilty of battery. — see also assault and battery 5 [count] baseball : the pitcher and catcher on a particular team