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rar·e·fac·tion
n 1 : the action or process of rarefying 2 : the quality or state of being rarefied : esp : an increase in porosity <areas of in the bones> 3 : a state or region of minimum pressure in a medium transversed by compressional waves (as sound waves) <the eardrum vibrates according to the compressions and s of the sound wave> rar*e*fac*tion*al adj
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