Etymology
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intercom (n.)
"radio or telephone intercommunication system," 1937, colloquial shortening of intercommunication, which is attested from 1911 in reference to systems of linked telephones.
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intercommunion (n.)
1749, "intimate intercourse, fellowship," from inter- "between" + communion (n.).
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intercommunication (n.)
mid-15c., "discussion, conference," from Anglo-Latin intercommunicationem; see inter- + communication. Attested from 1881 in reference to systems of linked telephones.
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intercommunicate (v.)
1580s, "communicate reciprocally," from inter- + communicate (v.) or else from Medieval Latin intercommunicatus, past participle of intercommunicare.
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