conglomeration

US /kənˌɡlɑː.mɚˈeɪ.ʃən/
UK /kənˌɡlɑː.mɚˈeɪ.ʃən/
1.

sự kết tụ

a large group or mass of different things all collected together in a messy or an unusual way:

:
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There was a strange conglomeration of objects on the mantelpiece.
:
conglomerate