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Definition: A dot used to separate the integral part of a number from the fractional part in the decimal number system. The point is either centred (as in 0.5) or, now more commonly, placed on the line (0.5), as in this Dictionary. In many European countries a comma is used (0,5).
Source: Nelson, David. The Penguin dictionary of mathematics 4th ed. London, New York. Penguin. 2008.