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Adjective: dimensionless  dI'men-shun-lus or di'men-shun-lus
  1. (physics) having dimension zero; expressible as a pure number not needing any units
    "any ratio of masses is dimensionless"

Encyclopedia: Dimensionless

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dime
dime a dozen
dime bag
dime novel
dimenhydrinate
dimension
dimensional
dimensional transmutation
dimensionality
dimensioning
dimensionless
dimer
dimercaprol
dimerous
Dimetane
Dimetapp
dimeter
dimethyl ketone
dimethylglyoxime
dimetrodon
diminish