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complex (adjective, noun)
Consisting of many different and connected parts, often making it difficult to understand or explain. It can also refer to a related group of buildings or a set of feelings that influence behavior.
"The instructions for the new software are quite complex."
Think of a 'Complex' as a 'Complicated Lexicon' (dictionary)—it has many parts and is hard to read!
I have a complex time. → I am having a difficult time.
She has a nice complex. → She has a nice complexion.
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