| Lemma | rarefy |
|---|---|
| Rank | 29384 |
| Frequency | 16 |
| Japanese | 稀薄にする |
| Commentary | (空気･ガスなどを)希薄にする(なる). 純化する. 浄化する |
| Example(eng) | But in 2003, when Clear was founded, biometric technology was rarefied, known to the public mostly through science fiction films. |
| Source | Claire Martin, New York Times, "Passing Through Airport Security With the Touch of a Finger," 8 Sep. 2017 |
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