Get an English Tutor
English word irrational comes from Latin rationalis, Latin ir-, and later Latin irrationalis (Irrational.)
rationalis (Latin)
Accounts (attributive). Rational, reasonable, of or possessing reason. Syllogistic. That has a ratio.
ir- (Latin)
irrationalis (Latin)
Irrational.
irrational (English)
A real number that can not be expressed as the quotient of two integers, an irrational number. (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers.. Not rational; unfounded or nonsensical.