Fr.: nombre irrationnel
A → real number which cannot be exactly expressed as a ratio a/b of two integers. Irrational numbers have decimal expansions that neither terminate nor become periodic. Every → transcendental number is irrational. The most famous irrational number is √ 2.
From ir- a prefix meaning "not," a variant of → in-, + → rational; → number.
Fr.: nombre rationnel
Any number that can be expressed as a ratio of two integers, providing the second number is not zero.