(adjective) being less dense / (adjective) of, relating to, or interesting to a select group; esoteric / (adjective) very high / (verb) to make rare, thin, porous, or less dense; to expand without the addition of matter / (verb) to make more spiritual, refined, or abstruse / (verb) to become less dense
Monopoly capitalism and the fascist state could not tolerate this autonomous sphere of life that represented a potential threat to the existing order, so they did to rarefied bourgeois culture what they did to the family