French décimal, from Medieval Latin decimalis of a tithe, from Latin decima tithe
- Date: 1608
Decimal notation often refers to the base-10 positional notation such as the Hindu-Arabic numeral system, however it can also be used more generally to refer to non-positional systems such as Roman or Chinese numerals which are also based on powers of ten.
In some contexts, especially mathematics education, the term decimal can refer specifically to decimal fractions. In such cases, a single decimal fraction is called a "decimal", and non-fractional numbers, even when written in base 10, are not considered "decimals".