Two interpretations of Chaos?

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Broadly speaking, I cannot pin down what is meant by Chaos. I understand that (informally) if a dynamical system is highly sensitive to initial input data then this system is said to be chaotic. Eg the famous Lorenz Equations. However, I have come across the following definition from theencyclopediaofmath.org which states "Chaos describes a situation where typical solutions (or orbits) of a differential equation (or typical evolutions of some other model describing deterministic evolution) do not converge to a stationary or periodic function (of time) but continue to exhibit a seemingly unpredictable behaviour." These two broad definitions seem to mean different things. Can anybody clear any of this up?