Also found in: Thesaurus, Encyclopedia, Wikipedia.
A dot written in a decimal number, as in 8.375, to indicate the place where values change from positive to negative powers of 10.
(Mathematics) a full stop or a raised full stop placed between the integral and fractional parts of a number in the decimal system
Usage: Conventions relating to the use of the decimal point are confused. The IX General Conference on Weights and Measures resolved in 1948 that the decimal point should be a point on the line or a comma, but not a centre dot. It also resolved that figures could be grouped in threes about the decimal point, but that no point or comma should be used for this purpose. These conventions are adopted in this dictionary. However, the Decimal Currency Board recommended that for sums of money the centre dot should be used as the decimal point and that the comma should be used as the thousand marker. Moreover, in some countries the position is reversed, the comma being used as the decimal point and the dot as the thousand marker
A period used in decimal notation to separate whole numbers from fractions, as in the number 1.3, which represents 1 + 3/10 .