abatement, achromatization, allayment, alleviating, alleviation, alleviative, assuagement, blanching, bleach, bleaching, blunting, brightening, calming, damping, deadening, decoloration, decolorization, decolorizing, demulsion, diminution, disburdening, discoloration, disembarrassment, disencumbering, disencumberment, disencumbrance, dulcification, dulling, easement, easing, enlightening, etiolation, fading, falling-off, hushing, illuminating, illumining, leniency, lessening, letdown, letup, lighting, loosening, lulling, madder bleach, market bleach, mitigation, modulation, mollification, pacification, paling, palliation, quietening, quieting, reduction, relaxation, relief, relieving, remission, slackening, softening, soothing, subduement, tempering, tranquilization, unballasting, unburdening, unfreighting, unlading, unloading, unsaddling, untaxing, unweighting, whitening

For further exploring for "lightening" in Webster Dictionary Online

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