1、meeting指会议，集会，可指各种大小规模的会议，是普通用词。
英文释义：an event at which people meet to discuss and decide things.
常用的搭配有summit meeting 峰会，press meeting记者招待会议，emergency meeting紧急会议等的用法。
2、session指法庭之休庭期，会议之会期。也可指大学的学期或一段上课时间，也可指一系列的（conference）中的一次。
英文释义：a formal meeting or group of meetings, especially of a law court or parliament
3、conference一般多指较大型，正式的会议。
例如CPPCC（Chinese People's Political Consultative Conference）中国人民政治协商会议。
英文释义：a large formal meeting where a lot of people discuss important matters such as business, politics, or science, especially for several days.
扩展资料
常见的表达会议的单词：
congress
指为讨论某些重大问题而由各地，各方代表参加的会议，如中国代表大会NPC（National People's Congress）;Congress 之美国国会。
英文释义：a formal meeting of representatives of different groups, countries etc, to discuss ideas, make decisions etc.
convention
指社会行为准则，社会习俗，惯例；也指社团，政党等为某一特殊目的（如，选举候选人）召开的大会。例如，Geneva Convention 日内瓦公约。
英文释义：a large formal meeting for people who belong to the same profession or organization or who have the same interests.
rally
（指人）集合起来（尤指重新努力, 如失败後或有危险﹑ 需要等时），也常指部队重新集结。
英文释义：a large public meeting, especially one that is held outdoors to support a political idea, protest etc.