adj
rational
RASH-nuhl
adj
1
Based on clear reasoning and logic rather than emotion.
"Try to make a rational decision instead of an impulsive one."
"His argument was calm and rational."
2
In mathematics, describing a number that can be written as a fraction of two whole numbers.
"3/4 is a rational number, but pi is not."
How to Use Rational
Learner’s notesIn plain EnglishSensible and logical, or (in math) expressible as a fraction.
Easily confused with
Common pairings
rational thought
rational number
rational decision
Word Forms
more rational comparative, rationals plural, rationals plural, most rational superlative
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Etymology
From Latin rationalis, "of reason," from ratio, "reason, calculation."
Related Words
Rhymes for rational
coronal
diagonal
personal
seasonal
national
optional
regional
hormonal
fictional
emotional
irrational
impersonal
See all rhymes for rational →