Decimal

Of or pertaining to decimals; numbered or proceeding by tens; having a tenfold increase or decrease, each unit being ten times the unit next smaller; as, decimal notation; a decimal coinage.

A number expressed in the scale of tens; specifically, and almost exclusively, used as synonymous with a decimal fraction.

a proper fraction whose denominator is a power of 10

numbered or proceeding by tens; based on ten; "the decimal system"