Definition of Arpanet
: an electronic communications network that was the predecessor to the Internet What he typed could not even be sent as an e-mail, in case it crashed the ancient Arpanet system; he had to send a message to say that it could be downloaded. — Michael Hart, The Economist, 24 Sept. 2011 In June 1966, Robert Taylor took over after Sutherland accepted a post at Harvard. He conceived of the ARPANET, a network that would turn computers into communication devices, not just data crunchers. — Tom Harvey, Salt Lake Tribune, 19 Dec. 2009
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