Foreign contribution definitions specify covered sources and transfers, clarifying what constitutes prohibited or regulated donations. The Act defines foreign contribution to include donations, transfers or deliveries of articles (subject to a small personal-use exception), any currency and specified foreign securities, including transfers passing through intermediaries. It defines foreign source by an inclusive list-foreign governments and agencies, specified international agencies, foreign companies and their subsidiaries, corporations incorporated abroad, multinational corporations, foreign trusts, societies, trade unions and foreign citizens-while permitting narrow exclusions by central notification.