1. In communications, interference (static) that destroys the integrity of signals on a line. Noise can come from a variety of sources, including radio waves, nearby electrical wires, lightning, and bad connections. One of the major advantages of fiber optic cables over metal cables is that they are much less susceptible to noise. See crosstalk or noise. 2. In general, anything that prevents a clear signal or message from being transmitted. For example, you might hear someone complain of a lot of noise in a newsgroup, meaning that there are many superfluous messages that don't add anything to the discussion. 3. A particular kind of memory (RAM) technology. 4. See static electricity. 5. An assigned condition, such as a memory allocation or network address. The exact opposite of this condition is dynamic in reference to the computer industry.