(~s)
1.
A ~ system involves counting in units of ten.
...the ~ system of metric weights and measures...
ADJ: ADJ n
2.
A ~ is a fraction that is written in the form of a dot followed by one or more numbers which represent tenths, hundredths, and so on: for example .5, .51, .517.
...simple math concepts, such as ~s and fractions.
N-COUNT