ＡＲＰＡ

noun

ARPA; Advanced Research Projects Agency

Refers to the U.S. Department of Defense agency; used in historical and technical contexts, especially regarding the early internet (ARPANET).

• ＡＲＰＡはインターネットの前ぜん身しんであるアーパネットを開かい発はつした。

  ARPA developed ARPANET, the predecessor of the internet.