n.1 a usu. electronic device for storing and processing data (usu. in binary form), according to instructions given to it in a variable program.
2 a person who computes or makes calculations.
Phrases and idioms:
computer-literate able to use computers; familiar with the operation of computers. computer science the study of the principles and use of computers. computer virus a hidden code within a computer program intended to corrupt a system or destroy data stored in it.