1. 议会；代表大会
    An assembly is a large group of people who meet regularly to make decisions or laws for a particular region or country.

assembly

    e.g. ...the campaign for the first free election to the National Assembly.
           呼吁国民议会召开首次自由选举的运动
    e.g. ...an assembly of party members from the Russian republic.
           俄罗斯共和国的党员代表大会

2. 集会;集会者
    An assembly is a group of people gathered together for a particular purpose.

    e.g. ...an assembly of women Olympic gold-medal winners...
           奥林匹克金牌女性获得者的集会
    e.g. He waited until complete quiet settled on the assembly.
           他一直等到集会的人群完全安静下来。

3. 集会（权利）
    When you refer to rights of assembly or restrictions on assembly, you are referring to the legal right that people have to gather together.

    e.g. The US Constitution guarantees free speech, freedom of assembly and equal protection...
           美国宪法保证言论自由、集会自由和受到平等保护的权利。
    e.g. They were accused of unlawful assembly.
           他们被控非法集会。

4. （全校师生的）晨会，早会
    In a school, assembly is a gathering of all the teachers and pupils at the beginning of every school day.

    e.g. By 9, the juniors are in the hall for assembly.
           到9点时，三年级学生都在大厅里等待参加晨会。
    e.g. ...a long room with a stage at one end for assemblies.
           一端设有早会用的高台的狭长房间

5. 装配；组装
    The assembly of a machine, device, or object is the process of fitting its different parts together.

assembly的意思

    e.g. For the rest of the day, he worked on the assembly of an explosive device.
           在那天余下的时间里，他继续组装爆炸装置。
    e.g. ...workers at Sao Paulo's car assembly plants.
           圣保罗汽车装配厂的工人