Republic of Yemen re·pub·li·cofyemen uncommon noun 1. a republic on the southwestern shores of the Arabian Peninsula on the Indian Ocean; formed in 1990 SynonymsYemenRepublic of Yemen Related words Broader terms Asian country Parts Arabian PeninsulaAsiaArab League Part of AdenHodeidaMukallaSanaYemeni WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.