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Chaos (pronounced kayos) (derived from the Ancient Greek Χάος, Chaos) typically refers to unpredictability, and is the antithesis of cosmos.

The word χάος did not mean "disorder" in classical-period ancient Greece. It meant "the primal emptiness, space". Chaos is derived from the Proto-Indo-European root ghn or ghen meaning "gape, be wide open": compare "chasm" (from Ancient Greek χάσμα, a cleft, slit or gap), and Anglo-Saxon gānian ("yawn"), geanian, ginian ("gape wide"); see also Old Norse Ginnungagap. Due to people misunderstanding early Christian uses of the word, the meaning of the word changed to "disorder". (The Ancient Greek for "disorder" is ταραχή).

For lessons on the topic of Chaos, follow this link.

Scientific and mathematical chaos

Mathematically, chaos means an aperiodic deterministic behavior which is very sensitive to its initial conditions, i.e., infinitesimal perturbations of initial conditions for a chaotic system lead to large variations of the orbit in the phase space.

Chaotic systems are systems that look random but aren't. They are actually deterministic systems (predictable if you have enough information) governed by physical laws, that are very difficult to predict accurately (a commonly used example is weather forecasting).

Furthermore, the word gas is probably an alteration of chaos. Particles in gases exhibit chaotic motion, although this was unknown to Jan Baptist van Helmont, the inventor of the term. He is instead believed to have been influenced by the concept of chaos in the occult theories of Paracelsus.