A two-way electronic communication system that allows people in different rooms or locations to talk to each other.
A 20th-century portmanteau of 'inter' (between) and 'communication.' It emerged with modern building technology to allow instant communication without walking between rooms.
The intercom was revolutionary for hospitals and offices—suddenly a receptionist could instantly alert a doctor or manager without running down hallways, which completely changed workplace efficiency in the 1930s onward.
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