See computer in Webster's New World College Dictionary
noun
a person who computes
a device used for computing; specif., an electronic machine which, by means of stored instructions and information, performs rapid, often complex calculations or compiles, correlates, and selects data; now, esp., digital computer
See computer in American Heritage Dictionary 4
(kəm-pyo͞oˈtər)
noun
A device that computes, especially a programmable electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information.