Meaning of COMPLEXITY in English

COMPLEXITY

/ kəmˈpleksəti; NAmE / noun

1.

[ U ] the state of being formed of many parts; the state of being difficult to understand :

the increasing complexity of modern telecommunication systems

I was astonished by the size and complexity of the problem.

2.

complexities [ pl. ] the features of a problem or situation that are difficult to understand :

the complexities of the system

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.