pertaining to tenths or to the number 10.

proceeding by tens: a decimal system.

decimal fraction.

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

any number used in the decimal system