什么叫峰会呢？听过好多次这个词了，求赐教。

挺多了，感觉这个词儿就是汉语词汇。
但实际上这个词是外来词，译自英文
【summit meeting】
这个词是 冷战时期的产物。当时美国与前苏联或与中国进行的会谈均被西方称之为峰会。英文解释如下：
A summit meeting (or summit) is a meeting of heads of state or government, usually with considerable media exposure, tight security and a prearranged agenda.
Notable summit meetings include those of Franklin D. Roosevelt, Winston Churchill and Joseph Stalin during World War II.
During the Cold War, when American presidents joined with Soviet or Chinese counterparts for one-on-one meetings, the media labelled the event as a "summit". The post-Cold War era has produced an increase in the number of "summit" events.
峰会，指是政府首脑参与的会议，有媒体曝光率高，安保措施严格，日程预先确定等特点。

详细解释请参阅百度百科：
http://baike.baidu.com/view/120045.htm