decimal

Decimal is defined as a system of numbers or currency where everything is based on the number ten, or on parts of ten.

(adjective)

3.432 is an example of a number described as a decimal number.

The definition of a decimal is a number written with a decimal point and a remainder that represents portions of ten.

(noun)

An example of a decimal is 2.5 which is two and five tenths.

See decimal in Webster's New World College Dictionary

adjective

of or based on the number 10; progressing by tens

Origin: OFr < ML decimalis < L decimus, tenth < decem, ten

noun

a fraction with an unwritten denominator of 10 or some power of 10, indicated by a point () before the numerator (Ex.: .5 = )
in full decimal fraction
any number written using a decimal point
in full decimal number

See decimal in American Heritage Dictionary 4

noun

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.
A number written using the base 10.

adjective