rarefaction rarebit • rarefactional · · · Info · Definitions · Characters · · rarefaction · · Text Latin · · Script 11 · · Length Definitions · · · (noun) a decrease in the density of something. Example: "A sound wave causes periodic rarefactions in its medium." · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074