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What does dimensionless mean?

Looking for the meaning or definition of the word dimensionless? Here's what it means.

Adjective
  1. Lacking dimensions.
  2. (sciences) (of a physical constant) Lacking units.
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The scores are in dimensionless units, rescaled with identical scale factors.
Some of these constants, such as the fine-structure constant, are dimensionless and are not expressed in terms of units.
The point of this laborious procedure is that this combination of multiplication and division produces a pure, dimensionless number.
A dimensionless number is displayed, which is infinity if the direction is vertical.
The screen turned featureless gray as the pickups stared blindly into some dimensionless noplace.
You will bind them to yours and shape the whole into a dimensionless sphere of pure controlled, dirigible energy.

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