rationalness

adjective

1. of, based on, or derived from reasoning: rational powers
2. able to reason; reasoning; in possession of one's reason or sanity
3. showing reason; not foolish or silly; sensible: a rational argument
4. Math.
   1. designating or of a real number or quantity expressible as the ratio of two integers, with the second integer not being equal to zero: all integers and fractions are rational numbers
   2. designating a function expressible as the quotient of two polynomials