A number which is very large compared to some characteristic number. For example, in optics, an object which is much further away than the focal length of a lens is said to be "at infinity", as the distance of the image from the lens varies very little as the distance increases further.
From Middle English infinite, from Old French infinité, from Latin infinitas ("unlimitedness"), from negative prefix in-, + finis, + noun of state suffix -tas.
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