/ Dictionary / Index E Erastian: Meaning and Definition of Find definitions for: E•ras•tian Pronunciation: (i-ras'chun, -tē-un), [key] — adj. of or pertaining to Thomas Erastus or Erastianism. —n. an advocate of Erastianism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Erasmus Erastianism Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language