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commensurability |
commensurable |
incommensurable |
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"Commensurability" refers to the property of being defined by compatible [[Measurement|units]]. For instance, the length of my toothbrush is commensurable with the distance between the Earth and the Moon--you can measure both in inches, or meters, or whatever--whereas the length of my toothbrush is incommensurable with the temperature of the room you are in right now---it makes no sense to speak of the length of your toothbrush in degrees Celsius or the temperature of your room in feet.