Definition of "dimensionless" in Anglais

adjective

1. Lacking dimensions.

   • 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.