[des-uh-muhl, des-muhl]
pertaining to tenths or to the number 10.
proceeding by tens: a decimal system.

1600–10; < Medieval Latin decimālis of tenths, equivalent to Latin decim(a) tenth (derivative of decem ten) + -ālis -al1

decimally, adverb

decimal, decimate, destroy (see usage note at decimate)(see synonym study at destroy). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decimal (ˈdɛsɪməl)
1.  Also called: decimal fraction a fraction that has a denominator of a power of ten, the power depending on or deciding the decimal place. It is indicated by a decimal point to the left of the numerator, the denominator being omitted. Zeros are inserted between the point and the numerator, if necessary, to obtain the correct decimal place
2.  any number used in the decimal system
3.  a.  relating to or using powers of ten
 b.  of the base ten
4.  (prenominal) expressed as a decimal
[C17: from Medieval Latin decimālis of tithes, from Latin decima a tenth, from decem ten]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from M.L. decimalis "of tithes or tenths," from L. decimus "tenth," from decem "ten" (see ten). Applied to Arabic notation before modern sense of "decimal fractions" emerged.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
decimal   (děs'ə-məl)  Pronunciation Key 
  1. A representation of a real number using the base ten and decimal notation, such as 201.4, 3.89, or 0.0006.

  2. A decimal fraction.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

decimals definition

Fractional numbers (see fraction) expressed as whole numbers of tenths, hundredths, thousandths, and so on. One-half, for example, is 0.5 in decimal terms.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
If you try to use the formula to calculate its value, you will discover that
  the decimals keep on appearing.
Recognize with some accuracy common fractions and decimals including money.
Recognize and name common fractions and decimals including money.
Compares and orders decimals through the thousandths place.
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