Longman Dictionary of Contemporary English homepage

complexity

 noun
     
com‧plex‧i‧ty plural complexities
1 [uncountable] the state of being complicated
complexity of
There is increasing recognition of the complexity of the causes of poverty.
a design of great complexity
2 [countable usually plural] one of the many details or features of something that make it hard to understand or deal with
complexity of
The complexities of economics are clearly explained.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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