Definition of "regressus" [regressus]

• In botany, that reversion of organs now known as retrogressive and retrograde metamorphosis. See metamorphosis. (noun)

The Century Dictionary (Public Domain)

• "The so-called regressus-method is a model for combining composition and resolution: the idea of this combinatory process is found in the Aristotelian tradition from Averroes on, and it was vitally revived among the Italian Aristotelians and medical authors."
• "If little or nothing were known about him, or only so much as those know who have already written of him, it might, in some ways, be possible to reconstruct him by a process of deductive analysis, by what the school logicians call the regressus a principiatis ad principia."
• "Nothing further is necessary, then, for the solution of the first cosmological problem, than to decide, whether, in the regress to the unconditioned quantity of the universe (as regards space and time), this never limited ascent ought to be called a regressus in infinitum or indefinitum."