iracionāls

Etymology
Via some other European language, ultimately from, from +.

The sense "radical; involving mathematical roots" is perhaps related to the fact that the square roots of most integers are irrational.

Adjective

 * 1) irrational not understandable by the mind, not rational, not reasonable
 * 2)  irrational not reducible to a fraction, and integer, or zero
 * 3)  radical involving mathematical roots
 * 1)  irrational not reducible to a fraction, and integer, or zero
 * 2)  radical involving mathematical roots
 * 1)  radical involving mathematical roots
 * 1)  radical involving mathematical roots

Usage notes
Although is the main adjective applied to concepts relating to roots, its antonym  is directly used in this context as well, this is because  (syn. ) is the Latvian term for  when talking about exponents and a number raised to a fractional power  is just a different notation to represent a root.