| Rarefaction (n.) The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air. Thesaurus Entries Sanforizing, abatement, adulteration, atrophy, attenuation, attrition, blunting, consumption, contour plowing, cultivating, cultivation, culture, cutting, damping, deadening, debilitation, devitalization, diluent, dilution, dissolvent, dressing, drying, drying up, dulling, effemination, emaceration, emaciation, enervation, enfeeblement, etherealization, evisceration, exhaustion, extenuation, fallowing, fatigue, furrowing, harrowing, hoeing, inanition, languishment, listing, mitigation, parching, plowing, preshrinkage, pruning, rarefaction, reduction, relaxation, resolutive, resolvent, searing, shrinkage, shrinking, shriveling, slackening, softening, solvent, subtilization, tilling, wasting, weakening, weeding, withering, working |