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Definition of decimal:
 A number expressed in the scale of tens; specifically, and almost exclusively, used as synonymous with a decimal fraction.
 Of or pertaining to decimals; numbered or proceeding by tens; having a tenfold increase or decrease, each unit being ten times the unit next smaller; as, decimal notation; a decimal coinage.
Synonyms:
calculable, coefficient, Arabic numeral, doubledigit, tenfold, arithmetic progression, hexadecimal, divisible, annualized, quantitative, constant, common multiple, base, cube root, decimal fraction, average, even, binary, common factor, cube, computation, denary, tenfold, indivisible.
Usage examples:

That seemed to be typical; the frontiers of science, now, were all decimal points.
 "Ministry of Disturbance", Henry Beam Piper. 
The dose should be five drops of the third decimal tincture with a spoonful of water every three or four hours.
 "Herbal Simples Approved for Modern Uses of Cure", William Thomas Fernie. 
Source immaterial of material naught, Focus of light infinitesimal, Sum of all things by sleepless Nature wrought, Of which abnormal man is decimal.
 "The Orpheus C. Kerr Papers. Series 1", Robert H. Newell.