Chaos is a state of extreme confusion and disorder. Putting a dozen dogs and a dozen cats in the same room would probably lead to utter chaos.

The word chaos derives from a Greek word meaning "chasm" or "void," which makes sense, given that chaos also refers to the formless state of matter before the cosmos was created. In math and science, chaos describes a system that will develop in wildly different ways with only tiny changes to the initial conditions. "Controlled chaos" is a phrase often used casually to describe something that looks out of control but which functions according to unseen rules or organization.

Definitions of chaos
  1. noun
    the formless and disordered state of matter before the creation of the cosmos
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    type of:
    physical phenomenon
    a natural phenomenon involving the physical properties of matter and energy
  2. noun
    a state of extreme confusion and disorder
    synonyms: bedlam, pandemonium, topsy-turvydom, topsy-turvyness
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    a word for chaos or fiasco borrowed from modern Hebrew (where it is a loan word from Russian)
    type of:
    disorder resulting from a failure to behave predictably
  3. noun
    (physics) a dynamical system that is extremely sensitive to its initial conditions
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    type of:
    dynamical system
    (physics) a phase space together with a transformation of that space
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