rarification (countable and uncountable, plural rarifications) Alternative form of rarefaction 1872, The American Journal of Science: As soon as the manometer...
From rarifica + -re. rarificare f (plural rarificări) rarification rarificare first/third-person singular future subjunctive of rarificar...
Science: As soon as the manometer of the pump indicated the maximum of rarification, the apparatus was inclined […] 1973, Thomas Pynchon, Gravity’s Rainbow:...