WORD ORIGIN

Late Middle English (in the sense ‘having the ability to reason’): from Latin rationalis, from ratio(n-) ‘reckoning, reason’, from rat ‘reckoned’, from the verb reri—the source also of ratio, rate, reason, etc.

irrational(ity),  irrationally,  ratio,  ratiocination,  rational,  rationale,  rationalisation,  rationalise,  rationalism,  rationalist(ic),  rationality,  rationally,  rationing
Only available upon request
Only available upon request
Only available upon request