dec·i·mal (d s  -ml)n. 1. A linear array of digits that represents a real number, every decimal place indicating a multiple of a negative power of 10. For example, the decimal 0.1 = 1/10 , 0.12 = 12/100 , 0.003 = 3/1000 . Also called decimal fraction. 2. A number written using the base 10. adj. 1. Expressed or expressible as a decimal. 2. a. Based on 10. b. Numbered or ordered by groups of 10. [Medieval Latin decim  lis, of tenths or tithes, from Latin decima, a tenth part or tithe, from decem, ten; see dek in Indo-European roots.]dec i·mal·ly adv. |
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