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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 rar·e·fac·tion /ˌrærəˈfækʃən, ˌrɛr-/
 變成稀薄,稀薄化,稀薄

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 rar·e·fac·tion /ˌrærəˈfækʃən, ˌrɛr-/ 名詞
 稀疏,疏鬆,稀疏狀態,疏鬆狀態

From: Webster's Revised Unabridged Dictionary (1913)

 Rar·e·fac·tion n.  The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air.
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From: WordNet (r) 2.0

 rarefaction
      n : a decrease in the density of something; "a sound wave causes
          periodic rarefactions in its medium"