Decimal number system and Positional notation

Decimal number system noun - A positional system of numeration that uses decimal digits and a base of ten.

Positional notation and decimal number system are semantically related. In some cases you can use "Positional notation" instead a noun phrase "Decimal number system".

Positional notation noun - A numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position.

Decimal number system and positional notation are semantically related. Sometimes you can replace phrase "Decimal number system" with "Positional notation", this phrases are similar.