complexity
n. C / Un. the state of having many different parts that are connected in a difficult or confusing way. You use this to describe something that is not simple and takes time to understand.
n. the state or quality of being intricate or compounded. Often refers to the degree of difficulty involved in understanding or managing a system with many interconnected variables.
The complexity of the new software makes it hard to use.
The legal team spent weeks analyzing the complexity of the international trade agreement before advising the client.
Modern urban planning must account for the inherent complexity of social dynamics, infrastructure requirements, and environmental impact to create truly sustainable living spaces.
From complex + -ity. Partially displaced native English manifoldness.
Uncountable when referring to the general quality of being complex; countable when referring to specific complicated features or details.