A 21st century laptop computer. a computer is a programmable machine that receives input stores and manipulates data and provides output in a useful format.. Computer n. a device that computes especially a programmable electronic machine that performs high-speed mathematical or logical operations or that Translations of computer. computer synonyms computer antonyms. information about computer in the free online english dictionary and encyclopedia.. Dell designs builds and customizes a broad range of computer products and services for consumer and professional use. find out about special deals on pcs and shipping buy a new computer online or get customer service support. Provider of technical information and services to computing professionals. Macintosh hardware software and internet tools. offering quicktime info developer resources and other items related to apple computers. We are all familiar with what a computer is in a specific contemporary sense.. but the term computer means more than simply the macs and pcs we are familiar with.. Computer definition at dictionary.com a free online dictionary with pronunciation synonyms and translation. look it up now! This page describes the term computer and lists other pages on the web where you can find additional information. Britannica online encyclopedia article on computer device for processing storing and displaying information.