|1.||using reason or logic in thinking out a problem|
|2.||in accordance with the principles of logic or reason; reasonable|
|3.||of sound mind; sane: the patient seemed quite rational|
|4.||endowed with the capacity to reason; capable of logical thought: man is a rational being|
|5.||maths expressible as a ratio of two integers or polynomials: a rational number; a rational function|
|6.||maths a rational number|
|[C14: from Latin ratiōnālis, from ratiō|
rational ra·tion·al (rāsh'ə-nəl)
Having or exercising the ability to reason.
Influenced by reasoning rather than by emotion.
Of sound mind; sane.
Based on scientific knowledge or theory rather than practical observation.