dimensionless

About 1.38 uses per million words.

Meaning

1. adjective Lacking dimensions.
2. adjective Of a physical constant: lacking units.

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

Similar words

unitless unscaled scaleless non-dimensional nondimensional adimensional sizeless lengthless zero-dimensional massless

Often followed by

form parameters parameter groups time variables quantity number numbers