動詞 rarefy:

1. lessen the density or solidity of
   同義詞：rarefy
2. make more subtle or refined
   同義詞：rarefy, sublimate, subtilize
3. weaken the consistency of (a chemical substance)
   同義詞：rarefy, attenuate

形容詞 rarefied:

1. having low density
   同義詞：rare, rarified
2. reserved for an elite group
   同義詞：rarified
3. of high moral or intellectual value; elevated in nature or style
   同義詞：exalted, sublime, grand, high-flown, high-minded, lofty, rarified, idealistic, noble-minded

rarefied 也作 rar.i.fied

adj.（形容詞）
Belonging to or reserved for a small, select group; esoteric.
秘密的：屬于一個挑選出來的小群人的；專為其保留的；秘傳的
Elevated in character or style; lofty.
高尚的：特點或風格高雅的；崇高的