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decimal system
The number system in use throughout most of the world today, based on 10.
decimal system (s) (noun) (no pl)
The system of notation for real numbers that uses place values and base 10: The decimal system is the number system used throughout most of the world.

The numbers to the right of the decimal point represent a fractional part of a whole number.

This entry is located in the following unit: Measurements and Mathematics Terms (page 5)