a) lacking dimensions

Iron has a density of 7.8g/cc: its dimensionless relative density is 7.8.

b) of a physical constant, lacking units.

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Look at other dictionaries:

  • Dimensionless — Di*men sion*less, a. Without dimensions; having no appreciable or noteworthy extent. Milton. [1913 Webster] …   The Collaborative International Dictionary of English

  • dimensionless — adjective see dimension I …   New Collegiate Dictionary

  • dimensionless — See dimensional. * * * …   Universalium

  • dimensionless — di·men·sion·less (dĭ menґshən ləs) denoting a numerical constant or variable that has no units of measurement …   Medical dictionary

  • dimensionless — adj. having no dimensions, lacking dimensions, lacking measurements of width height and length …   English contemporary dictionary

  • dimensionless — di·men·sion·less …   English syllables

  • dimensionless — nlə̇s adjective : having no dimensions …   Useful english dictionary

  • Dimensionless quantity — In dimensional analysis, a dimensionless quantity or quantity of dimension one is a quantity without an associated physical dimension. It is thus a pure number, and as such always has a dimension of 1.[1] Dimensionless quantities are widely used… …   Wikipedia

  • Dimensionless momentum-depth relationship in open-channel flow — Contents 1 Momentum in Open Channel Flow 1.1 What is Momentum? 1.2 Momentum in a Rectangular Channel 1.3 Why is Momentum Important? …   Wikipedia

  • Dimensionless physical constant — In physics, a dimensionless physical constant (sometimes fundamental physical constant) is a universal physical constant that is dimensionless having no unit attached, so its numerical value is the same under all possible systems of units. The… …   Wikipedia

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