complexity
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.