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“complex” in Latin

The English word complex itself goes back to Latin plectō, through complexus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

complex
ex diversis partibus compositus: complexus (term of logic), concretus (concrete, compounded): multiplex (manifold).

Quick answer

What is the Latin word for complex?
The usual Latin words for “complex” are complector, concernō, multiplex. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.