RATIONAL

I. adjective Etymology: Middle English racional, from Anglo-French racionel, from Latin ~is, from ration-, ratio Date: 14th century 1. having reason or understanding, relating to, based on, or agreeable to reason ; reasonable , involving only multiplication, division, addition, and subtraction and only a finite number of times, relating to, consisting of, or being one or more ~ numbers , ~ly adverb ~ness noun II. noun Date: 1606 something ~