Definition of "unitless" [unitless]

• Having no units of measurement; such as a ratio or percentage of two numbers which have the same units. (adjective)

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• "Gross tonnage (often abbreviated as GT, G.T. or gt) is a unitless index related to a ship's overall internal volume."
• "Albedo is a non-dimensional, unitless quantity that indicates how well a surface reflects solar energy."
• "Also in a pure unit sense, say if we equate distance with time the speed of light is then “unitless,” and so similar to the fine structure constant is then simply a constant."