The bed of a stream or river. The deeper part of a river or harbor, especially a deep navigable passage. A broad strait, especially one that connects two seas. A route of communication or access: took her request through official channels. In communications theory, a gesture, action, sound, written or spoken word, or visual image used in transmitting information. Electronics A specified frequency band for the transmission and reception of electromagnetic signals, as for television signals. A continuous program of audio or video content distributed by a television, radio, or internet broadcaster.