the quality of being intricate and compounded
"he enjoyed the complexity of modern computers"
The state of being complex; intricacy; entanglement.
"The sheer complexity of the project's wiring made it impossible to troubleshoot without a detailed schematic."
In plain English: Complexity is how many different parts something has and how hard it is to figure out how they all work together.
"The complexity of the new software made it hard to install."
Usage: Use complexity to describe something that has many interconnected parts or features making it difficult to understand or analyze. Avoid using it simply to mean difficulty or confusion without implying structural intricacy.
The word complexity entered English from Latin via French, combining the root complex with the suffix -ity. It largely replaced the older native term "manifoldness" to describe a state of being intricate or complicated.