decimal

American  

[des-uh-muhl, des-muhl] / ˈdɛs ə məl, ˈdɛs məl /

adjective

1. pertaining to tenths or to the number 10.

2. proceeding by tens.

   a decimal system.

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noun

• decimals
  plural

1. decimal fraction.

decimal British  

/ ˈdɛsɪməl /

noun

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

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adjective

1. 1. relating to or using powers of ten

   2. of the base ten

2. (prenominal) expressed as a decimal

decimal Scientific  

/ dĕs′ə-məl /

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.

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Other Word Forms

Derived Forms

• decimally
  adverb

Inflected Forms

Nouns

• decimals
  plural

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Etymology

Origin of decimal

First recorded in 1600–10; from Medieval Latin decimālis “of tenths,” equivalent to Latin decim(a) “tenth” (derivative of decem “ten” ) + -ālis adjective suffix; see ten, -al ¹

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Explanation

A decimal is a fraction written in a special form. Instead of writing 1/2, for example, you can express the fraction as the decimal 0.5, where the zero is in the ones place and the five is in the tenths place. Decimal comes from the Latin word decimus, meaning tenth, from the root word decem, or 10. The decimal system, therefore, has 10 as its base and is sometimes called a base-10 system. Decimal can also specifically refer to a number in the decimal system. As an adjective, decimal means something related to this numbering system. The decimal point, for example, refers to the period that separates the ones place from the tenths place in decimal numbers.

Example Sentences

See Examples For:

decimal decimals

Another thing many TAM estimates have in common is that they’re oddly specific, often going out a decimal point.

From The Wall Street Journal ● Oct. 2, 2026

It frees a student from memorizing all formulas, such as pi to the fourth decimal, but not from knowing whether an answer is right, he said.

From Los Angeles Times ● Aug. 27, 2026

What mattered was mostly the initial integer, or what was “to the left of the decimal point,” rather than anything more exact.

From MarketWatch ● Jun. 17, 2026

Sharp, who worked at the Greenwich Royal Observatory and has a crater on the moon named after him, was also a mathematician who calculated pi to 72 decimal places.

From BBC ● Apr. 1, 2026

First thing in the morning, when the doors reopened, she needed to search through the Dewey decimal rooms to find a clue that would tell her exactly how and where the bandits had crawled in.

From "Escape from Mr. Lemoncello's Library" by Chris Grabenstein

Only resounding wins over their nearest rivals now return a few more decimals.

From BBC ● Aug. 21, 2025

The leaders of those and other rate stats — expressed with decimals — are now sprinkled with Negro League standouts.

From Los Angeles Times ● May 29, 2024

Eventually she leads us toward more abstract concepts such as the polar coordinate system, a graphical approach to defining a point using distance and angle, as well as irrational numbers and decimals that repeat infinitely.

From Scientific American ● Jun. 20, 2023

When we work with decimals, it is often necessary to round the number to the nearest required place value.

From Textbooks ● May 6, 2020

No one wanted to “leap ahead” with more decimals, so the room was quiet.

From "P.S. Be Eleven" by Rita Williams-Garcia

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