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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.
1. the quality or state of being modal. 2. an attribute or circumstance that denotes mode or manner. 3. Also called mode. the classification of logical propositions according to whether they are contingently true or false, possible, impossible, or necessary.