ellipsis (n.) Look up ellipsis at Dictionary.com
1560s, "an ellipse," from Latin ellipsis, from Greek elleipsis "a falling short, defect, ellipse in grammar," noun of action from elleipein "to fall short, leave out," from en- "in" (see en- (1)) + leipein "to leave" (from PIE root *leikw- "to leave"). Grammatical sense in English first recorded 1610s. Related: Elipticity.