/ahd"n, ayd"n/ , n.
1. a seaport in and the economic capital of the Republic of Yemen, in the S part: formerly the center of a British colony. 318,000.
2. Colony of . Also called State of Aden . a former British colony on the Gulf of Aden and a member of the former Federation of South Arabia. 75 sq. mi. (194 sq. km).
3. Protectorate of , former name, until 1962, of the former Protectorate of South Arabia.
4. Gulf of , an arm of the Arabian Sea between the E tip of Africa and the Arabian Peninsula.