Pronunciation: (di-tekt'),[key] —v.t. 1. to discover or catch (a person) in the performance of some act: to detect someone cheating. 2. to discover the existence of: to detect the odor of gas. 3. to find out the true character or activity of: to detect a spy. 4. Telecommunications. a. to rectify alternating signal currents in a radio receiver.
b. to demodulate.