Extended objects may be separated by dimensionless points; but dimensionless points cannot be separated, but by some real distance, or something really extended.

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.

Iron has a density of 7.8 grams per cubic centimeter: its dimensionless relative density is 7.8.

Dimensionless

Meaning

Adj

Origin

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