What is the full form of ARPANET?

Concept

An acronym may be formed from the name of an organization or system. Its expansion must preserve the established words represented by the abbreviated form.

ARPANET combines the agency name ARPA with NET for network, so identifying the historical name behind ARPA determines the expansion.

Application

ARPA was the Advanced Research Projects Agency of the United States Department of Defense. Adding Network to that agency name gives Advanced Research Projects Agency Network.

Contrast

• American Research Projects Advance Network substitutes “American” and “Advance” for words in the agency name.

• American Research Programs Advance Network also substitutes “Programs” for “Projects”.

• Advanced Research Programs Academic Network uses “Programs” and “Academic” instead of the agency-name terms.

• Advanced Research Projects Agency Network retains the historical agency name and adds Network.

Cross-check

The agency abbreviation ARPA expands to Advanced Research Projects Agency; appending NET yields ARPANET. Therefore, the full form is Advanced Research Projects Agency Network.