rarefaction Synonyms

underpressure purification pullulation inflation increment increase helium growth filtering extension expansion rarefying rareness processing void vacuum vacua vacuity thinning subtilization refinement rectification rarity exhaustion enlargement baptism augmentation attenuation atmosphere argon amplification ammonia aggrandizement acetylene absolution bathing butane distillation dispansion disinfection dilution diluteness dilation dilatation development depuration clarification ablution