• synonyms


  1. not having rotation.
  2. Mathematics. conservative(def 7).
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Origin of irrotational

First recorded in 1870–75; ir-2 + rotational
Related formsir·ro·ta·tion·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for irrotational

Historical Examples

  • A stream line is the line, straight or curved, traced by a particle in a current of fluid in irrotational movement.

    Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 1


  • A second-order effect on direction may therefore be produced by irrotational motion, but not a first-order effect.

    The Ether of Space

    Oliver Lodge

  • It is important to distinguish between two types of strain: the “rotational” type and the “irrotational” type.