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English word complexity comes from English -ity, English complex
-ity (English)
Used to form a noun from an adjective; especially, to form the noun referring to the state, property, or quality of conforming to the adjective's description.. Used to form other nouns, especially abstract nouns.
complex (English)
(chemistry) A structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules.. (math) A complex number.. A collection of buildings with a common purpose, such as a university or military base.. A problem.. A psychological dislike or fear of a particular thing.. An assemblage of related things; a collection.. An organized cluster of thunderstorms. [...]
complexity (English)
(countable) That which is and renders complex; intricacy; complication.. (uncountable) The state of being complex; intricacy; entanglement.