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Computing (FOLDOC) dictionary (also found in English - Vietnamese, English - English (Wordnet), French - Vietnamese)
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[Mathematics] a fractional number n/d, where n and d are
integers, n is the numerator and d is the denominator. The
set of all rational numbers is usually called Q.
Computers do not usually deal with rational numbers but
instead convert them to real numbers which are represented
(approximately in some cases) as floating-point numbers.
Compare irrational.
Comments and discussion on the word "rational"