Englishfor English speakers
acceleration
Noun
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Acceleration is a change in speed.
As the plane took off, the acceleration pressed her into her seat.
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Acceleration is by how much a speed or velocity goes up.
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derivative for velocity,has formula matha=\lim_{\Delta x \to 0}\frac{\Delta v}{\Delta t}/math .
aging
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noun
(= ageing)
the organic process of growing older and showing the effects of increasing age
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adjective
growing old
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noun
(= ripening)
acquiring desirable qualities by being left undisturbed for some time