| verb | lessen the density or solidity of “The bones are rarefied” |
| verb | make more subtle or refined |
| verb | weaken the consistency of (a chemical substance) |
| adjective | having low density “rare gasses” |
| adjective | of high moral or intellectual value; elevated in nature or style; ; - Oliver Franks “an exalted ideal” |
| rarefaction | noun | a decrease in the density of something |
| attenuation | noun | the property of something that has been weakened or reduced in thickness or density |
| rarity | noun | a rarified quality |
| grandness | noun | the quality of being magnificent or splendid or grand |
| high-mindedness | noun | elevated ideals or conduct; the quality of believing that ideals should be pursued |
| idealism | noun | elevated ideals or conduct; the quality of believing that ideals should be pursued |
| noble-mindedness | noun | elevated ideals or conduct; the quality of believing that ideals should be pursued |