Longman Dictionary of Contemporary English homepage

decimal

1 noun
     
Related topics: Numbers
dec‧i‧mal1 [countable]
a fraction (=a number less than 1) that is shown as a full stop followed by the number of tenths, hundredths etc. The numbers 0.5, 0.175, and 0.661 are decimals
Definition from the Longman Dictionary of Contemporary English
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