2 noun
com‧plex2 [countable]
1TBB a group of buildings, or a large building with many parts, used for a particular purpose:
The town has one of the best leisure complexes in the country.
a three-story apartment complex

a complex of something

formal a large number of things which are closely related:
China was a complex of different societies.
3MP an emotional problem in which someone is unnecessarily anxious about something or thinks too much about something:
I used to have a complex about my looks.

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