rational

1. Capable of reasoning.

   Man is a rational creature.

   vernünftig, sinnvoll, rational

   мы́слящийmýsljaščij, разу́мныйrazúmnyj, рациона́льныйracionálʹnyj

   capable of being expressed as a quotient of integers

2. Capable of reasoning.

   Behaving according to some partial order of preferences.

3. Logically sound; not self-contradictory or otherwise absurd.

   His statements were quite rational.

   vernünftig

   рациона́льныйracionálʹnyj, разу́мныйrazúmnyj, целесообра́зныйcelesoobráznyj

   раціона́льнийracionálʹnyj

4. Healthy or balanced intellectually; exhibiting reasonableness.

   rational conduct

5. Comprising, or expressible as, a ratio

   (not comparable)Of a number, capable of being expressed as the ratio of two integers.

   ¾ is a rational number, but √2 is an irrational number.

   rational

   рациона́льныйracionálʹnyj

   раціона́льнийracionálʹnyj

6. (not comparable)Of an algebraic expression in indeterminates, or more generally a function: capable of being expressed as the ratio of two polynomials.

7. (not comparable)Of a variety: (informally) geometrically simple almost everywhere; (formally) birationally equivalent to projective space

8. (not comparable)Of a function between varieties: acting as a morphism on an open subset of its domain.

9. (not comparable)Of a point on an algebraic variety over a field: whose coordinates belong to the field in question (in contrast to those points of the variety which are only defined over the algebraic closure of the base field).

10. (obsolete)Synonymous replacement for "condensed" in condensed formula.

1. His argument was far from rational.

   Його аргумент був далеко не раціональний.

   ruЕго аргумент был далеко не рациональным.

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2. Tom is rational.

   Том раціональний.

   deTom ist rational.

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3. Tom is not a rational guy.

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4. I'm sure there's a rational explanation for this.

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5. It seemed like the only rational thing to do.

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regular