Complexity is the state of having many parts and connections, making something hard to fully understand, predict, or manage. It can apply to systems, problems, or ideas.
From Latin *complexitas*, from *complexus* “entwined, embraced,” from *com-* “together” + *plectere* “to braid.” It emphasizes the tangled, interwoven nature of many elements.
Complexity is what happens when ‘more’ turns into ‘different’—when adding parts creates new behaviors you couldn’t predict from the parts alone. That’s why complex problems can’t be solved by just fixing one piece; the relationships between pieces are the real puzzle.
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