fed·e·ra·tion /ˌfedəˈreɪʃən/ AWL noun2 [countableC]PPG a group of states that have joined together to form a single group 聯邦the Russian Federation 俄羅斯聯邦
3. [uncountableU]PPGSSO when groups of people, states etc join together to form a larger group 聯邦;同盟