rarefied
adj [ɹɛrəˌfaɪd]
Something described as rarefied is understood or appreciated by only a small or select group of people; the word is a synonym of esoteric. Rarefied can also be used technically to mean “being less dense,” a use that is typically applied to air that has less oxygen in it because of high elevation.
from a combination of the Latin words rarus (“thin” or “rare”) and facere (“to make”)
English
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO?
Memorize
