An assembly is a large group of people who meet regularly to make decisions or laws for a particular region or country.

An assembly is a group of people gathered together for a particular purpose.

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

In a school, assembly is a gathering of all the teachers and pupils at the beginning of every school day.

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