refine; lessen the density or solidity of
Altitude causes the air to rarefy, making breathing more difficult.
Vocabulary like rarefy appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
extreme; far beyond the norm in opinions or actions
excite; gather together for a common purpose
wander; continue talking or writing in a desultory manner
widespread; unrestrained and violent
falling apart; in deplorable condition
ill smelling; corrupt
bitter resentment
scolding speech; talk in a noisy, excited manner
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