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abbreviation. noun. Modem is defined as an abbreviation for modulator-demodulator, a device that makes it possible for computers to communicate with one another without being directly connected to each other. An example of a modem is the device used for a computer to communicate with a satellite.
Types of Modem. 1  Simplex â A simplex modem can transfer data in only one direction, from digital device to network (modulator) or network to digital device (demodulator). 2  Half duplex â A half-duplex modem has the capacity to transfer data in both the directions but only one at a time.