| Noun | 1. | Advanced Research and Development Activity - an agency of the Intelligence Community that conducts advanced research and development related to information technology bureau, federal agency, government agency, agency, office, authority - an administrative unit of government; "the Central Intelligence Agency"; "the Census Bureau"; "Office of Management and Budget"; "Tennessee Valley Authority" IC, Intelligence Community, National Intelligence Community, United States Intelligence Community - a group of government agencies and organizations that carry out intelligence activities for the United States government; headed by the Director of Central Intelligence |