Definition of "rarefying" []

• Present participle of rarefy. (verb)

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• "On the other hand, at the top of the valuation range Iberdrola Renovables would be worth €4 million per megawatt -- clearly putting it at an altitude where the air is rarefying."
• "And the South, rarefying, is changed into the East; but the"
• "And this, in my opinion, is the reason why the night is more sonorous, and the day less; since in the day, the heat rarefying the air makes the empty spaces between the particles to be very little."