dimensionless

Etymology

From dimension + -less.

adj

  1. Lacking dimensions.
    Extended objects may be separated by dimensionless points; but dimensionless points cannot be separated, but by some real distance, or something really extended. 1771, William Kenrick, A Lecture on Perpetual Motion, London: for the author, Introduction, page 15
    1930, E. E. Smith, Skylark Three, Fantasy Press, 1948, Chapter 3, They saw the utter, absolute darkness of the complete absence of all light; and upon that indescribable blackness they beheld superimposed the almost unbearable brilliance of enormous suns concentrated into mathematical points, dimensionless.
  2. (sciences) Of a physical constant: lacking units.
    Iron has a density of 7.8 grams per cubic centimeter: its dimensionless relative density is 7.8.

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