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Odd vs Irrational - What's the difference?

odd | irrational | Related terms |

Odd is a related term of irrational.


As an initialism odd

is oppositional defiant disorder.

As an adjective irrational is

not rational; unfounded or nonsensical.

As a noun irrational is

a real number that can not be expressed as the quotient of two integers, an irrational number.

odd

English

Adjective

(en-adj)
  • (not comparable) Single; sole; singular; not having a mate.
  • (obsolete) Singular in excellence; unique; sole; matchless; peerless; famous.
  • Singular in looks or character; peculiar; eccentric.
  • Strange, unusual.
  • *
    • , title=(The Celebrity), chapter=5 , passage=We made an odd party before the arrival of the Ten, particularly when the Celebrity dropped in for lunch or dinner. He could not be induced to remain permanently at Mohair because Miss Trevor was at Asquith, but he appropriated a Hempstead cart from the Mohair stables and made the trip sometimes twice in a day.}}
  • (not comparable) Occasional; infrequent.
  • * (Sir Walter Scott), Guy Mannering – or The Astrologer
    • I assure you, if I were Hazlewood I should look on his compliments, his bowings, his cloakings, his shawlings, and his handings with some little suspicion; and truly I think Hazlewood does so too at some odd times.
  • (not comparable) Left over, remaining when the rest have been grouped.
  • (not comparable) Casual, irregular, not planned.
  • (not comparable, in combination with a number, not comparable) About, approximately.
  • (not comparable) Not divisible by two; not even.

    • Synonyms

    * (not having a mate) single, mismatched * (strange) bizarre, peculiar, queer, rum, strange, unusual, weird, fremd * (about) about, approximately, around * See also

    Antonyms

    * (not divisible by two) even

    Derived terms

    * oddball * odd duck * odd one out * odds

    Related terms

    * (l) * (l)

    Anagrams

    * *

    irrational

    English

    Adjective

    (en adjective)
  • Not rational; unfounded or nonsensical.
    • an irrational decision
  • * July 18 2012 , Scott Tobias, AV Club The Dark Knight Rises [http://www.avclub.com/articles/the-dark-knight-rises-review-batman,82624/]
    • Where the Joker preys on our fears of random, irrational acts of terror, Bane has an all-consuming, dictatorial agenda that’s more stable and permanent, a New World Order that’s been planned out with the precision of a military coup.
  • (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the ratio of two integers.
    • The number π is irrational .

    Antonyms

    * (mathematics) rational

    Hyponyms

    * (mathematics) transcendental

    Derived terms

    * irrational number * irrationality * irrationalize * irrationalization

    Noun

    (en noun)
  • A real number that can not be expressed as the quotient of two integers, an irrational number.
  • * 1946 , (Bertrand Russell), History of Western Philosophy , I.24:
    • The square root of 2, which was the first irrational to be discovered, was known to the early Pythagoreans, and ingenious methods of approximating to its value were discovered.