complex + -ity

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noun (plural complexities)

the state or quality of being intricate or complicated:

(事･物の)複雑さ, 複雑性, 錯綜（さくそう）(↔ simplicity)

e.g. an issue of great complexity.

(usually complexities) a factor involved in a complicated process or situation:

〖通例-ties〗複雑なもの

e.g. the complexities of family life.