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channel

n. ~ 1. Broadcasting ยท A circuit or portion of a frequency spectrum set aside for carrying information. - 2. A portion of a signal that carries information in parallel with other portions, which are assembled to make a whole. - 3. A path of communication between people; for example, official channels, proper channels. - 4. A trench, tube, or path directing the passage of materials.

Notes: 

Examples of channel1 include television and radio channels. - An example of channel2 is stereo, which uses a left and right channel that are combined to give a sense of acoustic space. - Microfilm jackets have channels4 to hold strips of microfilm.