a city in the state of North Rhine-Westphalia in Germany; pop. 296,240 (1991). From 1949 until the reunification of Germany in 1990 Bonn was the capital of the Federal Republic of Germany 波恩(德國(guó)萊茵威斯特伐利亞州北部城市;1991年人口296,240;從1949年到1990年兩德統(tǒng)一之前,波恩一直是德意志聯(lián)邦共和國(guó)的首都)