Capable of reasoning.
Man is a rational creature.
Logically sound; not self-contradictory or otherwise absurd.
His statements were quite rational.
Healthy or balanced intellectually; exhibiting reasonableness.
rational conduct
A rational number: a number that can be expressed as the quotient of two integers.
The quotient of two rationals is again a rational.
The breastplate worn by Israelite high priests.
From Old French rationel, rational, from Latin rationalis (“of or belonging to reason, rational, reasonable; having a ratio”), from ratio (“reason; calculation”).
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The Rationale of iudgement alſo thou shalt mke with embrodered worke of diuers colours, according to the workmanship of the Ephod of gold, hyacinth, and purple, and ſcarlet twiſe died, and twiſted ſilke.