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a. A linear array of digits that contains a single period, called the decimal point, is possibly preceded by a minus sign (-), and represents a real number, with each successive digit to the right of the decimal point indicating a multiple of the next negative power of 10, and each successive digit to the left of the decimal point indicating a multiple of the next non-negative power of ten, beginning with 100 = 1. For example, 245.3 represents the real number (2 × 102) + (4 × 101) + (5 × 100) + (3 × 10-1) = 200 + 40 + 5 + 3/10 , and -1.04 represents the real number (-1 × 100) + (-4 × 10-2). Also called mixed decimal.
b. Such an array of digits in which there are no nonzero digits to the left of the decimal point, representing a real number between -1 and 1. Also called decimal fraction.
2. A number written using the base 10.
1. Expressed or expressible as a decimal.
a. Based on 10.
b. Numbered or ordered by groups of 10.

[Medieval Latin decimālis, of tenths or tithes, from Latin decima, a tenth part or tithe, from decem, ten; see dekm̥ in Indo-European roots.]

dec′i·mal·ly adv.
References in periodicals archive ?
vulnificus was examined after 90 min, 100 [micro]L was taken from each sample and decimally diluted with saline.
A Fuess-type pluviograph was used with daily intervals, a millimeter-graduated vertical scale that was subdivided decimally, and an hour-graduated horizontal scale that was subdivided at 10 minutes.
Peresvetov also recognized Muscow's weakness in this regard and proposed the creation of a 20,000-strong infantry palace guard equipped with firearms and organized decimally like the Janissaries.