Decimal

a. [Fr. décimal, L. Lat. decimalis, from Lat. decimus, tenth, from decem, ten.] Of, or pertaining to, decimals; numbered or proceeding by tens; having a tenfold increase or decrease; as, decimal notation; a decimal coinage.

Decimal arithmetic, the common arithmetic in which numeration proceeds by tens. — Decimal fractions, fractions in which the denominator is some power of 10, as ²⁄₁₀, ²⁵⁄₁₀₀, and is not usually expressed, but is signified by a point placed at the left hand of the numerator; as, .2, .25. — Decimal point, a dot or full stop at the left of a decimal fraction to separate it from the whole number which it follows, as 1.05.