■ adjective relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.
■ noun a fraction whose denominator is a power of ten and whose numerator is expressed by figures placed to the right of a ~ point.
↘a system of ~ numerical notation.
Derivatives
~ly adverb
Origin
C17: from mod. L. ~is (adjective), from L. decimus 'tenth'.