There are many types of computer networks. Common types of networks include the following: 1  Local-area network (LAN): The computers are geographically close together (that is, in the same building).  Wide-area network (WAN): The computers are farther apart and are connected by telephone lines or radio waves.
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Medical Definition of medicine. 1  1: a substance or preparation used in treating disease. 2  2a: the science and art dealing with the maintenance of health and the prevention, alleviation, or cure of diseaseb: the branch of medicine concerned with the nonsurgical treatment of disease.