ARPANET

A1R1P3A1N1E1T1
US/ˈɑɹ.pəˌnɛt/

Initialism of Advanced Research Projects Agency Network, the world's first operational packet-switching network.

Less commonScrabble 9

Meanings

ARPANET1

proper nounARPANET or the ARPANET

alternative ARPAnet

  1. abbreviationinitialismcomputingInitialism of Advanced Research Projects Agency Network, the world's first operational packet-switching network.

    ARPANET went online in September, 1969, and connected four computers located in California and Utah.

    2001, Bryan Pfaffenberger, Computers in Your Future, Pearson College Division, →ISBN, page 267
    2 more examples

    The ARPANET was especially important to the Internet project, and was often called the backbone network because it was the central WAN that tied researchers together.

    2007, Douglas Comer, The Internet Book […] , Prentice Hall, →ISBN

    It allowed the ARPANET, a single network, to develop into the Internet—an internetwork of hundreds of thousands of networks.

    2009, John Cassidy, Dot.Con […] , Harper Collins, →ISBN, page 17

ARPAnet2

proper nounARPAnet or the ARPAnet
  1. alternativeAlternative spelling of ARPANET.

Origin

From earlier ARPA (“Advanced Research Projects Agency”) with net for network.

Full word history & related roots →

Rhymes & wordplay

Anagrams

Cite this entry
APA

ARPANET. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ARPANET

MLA

“ARPANET.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ARPANET. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ARPANET,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ARPANET.

Source: ARPANET on Wiktionary, CC BY-SA 4.0.