Decimal Definition
dĕsəməl
decimals
noun
decimals
A fraction with an unwritten denominator of 10 or some power of 10, indicated by a point (decimal point) before the numerator (Ex.: .5 =^{5}_{10})
Webster's New World
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.
American Heritage
Any number written using a decimal point.
Webster's New World
(informal) A decimal place.
Pi has a value of 3.141, to three decimals.
Wiktionary
Synonyms:
adjective
(arithmetic, computing) Concerning numbers expressed in decimal or mathematical calculations performed using decimal.
Wiktionary
Expressed or expressible as a decimal.
American Heritage
Of or based on the number 10; progressing by tens.
Webster's New World
Numbered or ordered by groups of 10.
American Heritage
Synonyms:
Other Word Forms of Decimal
Noun
Singular:
decimal
Plural:
decimalsOrigin of Decimal

Medieval Latin decimālis of tenths or tithes from Latin decima a tenth part or tithe from decem ten dekm̥ in IndoEuropean roots
From American Heritage Dictionary of the English Language, 5th Edition

From Medieval Latin decimalis, from Latin decimus, from decem, ten + adjective suffix alis
From Wiktionary
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