assembly
US /əˈsem.bli/
UK /əˈsem.bli/

1.
a group of people gathered together in one place for a common purpose
:
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The school held a special assembly for the graduating students.
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The general assembly will vote on the new proposal.
2.
the action of gathering people or things together
:
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The assembly of the team for the project took several days.
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The assembly of evidence was crucial for the case.
3.
the process of putting together the parts of a machine or structure
:
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The car factory has a highly automated assembly line.
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The furniture requires some assembly before use.