(military) The networks of land, water, and air routes that connects a battlefield and its military personnel, supplies, etc. / A chain of communications through an established system.

plural of spirit communication

(parapsychology) The practice of living humans purportedly speaking or otherwise communicating with spirits of deceased individuals, as through seances, mediums, etc.

plural of meta-communication

plural of communication mix

plural of communications zone

Communication directed to the mass of the people or through mass media. / The field of study concerning this.

plural of nonverbal communication

The distribution of data and other signals via electric power distribution wires

A form of electromagnetic communication in which the signal frequency or bandwidth is spread beyond that required, rendering it more difficult to intercept or jam, or to send multiple signals over the same band