• IPA^(key): /ˈɑɹ.pə/

ARPA

1. (military, US, historical) Acronym of Advanced Research Projects Agency, renamed to DARPA in 1972.
2. (navigation) Initialism of Automatic Radar Plotting Aid.
3. (US politics) Acronym of American Rescue Plan Act.
   • 2025 May, “The One, Big, Beautiful Bill”, in United States House Committee on Ways & Means‎^[1], page 26:

     This reverses the ARPA provision that lowered the reporting threshold to $600 with no minimum on the number of transactions.

4. (politics) Initialism of Association for Reformed Political Action.

• ARPA-E

• paar, para, apar, para-, Para., para., Raap, ARAP, Rapa, AARP, Paar, APAR, Pará