1. a forecast or prediction.
  2. an omen or portent; sign.

Origin of prognostic

1375–1425; (adj.) late Middle English pronostik < Medieval Latin prognōsticus < Greek prognōstikós of foreknowledge, equivalent to pro(gi)gnṓs(kein) to know1 beforehand + -tikos -tic (see pro-2, gnostic); (noun) < Latin prognōsticon < Greek prognōstikón, neuter of prognōstikós
Related formsprog·nos·ti·ca·ble, adjectiveprog·nos·ti·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for prognostically


  1. of, relating to, or serving as a prognosis
  2. foretelling or predicting
  1. med any symptom or sign used in making a prognosis
  2. a sign or forecast of some future occurrence

Word Origin for prognostic

C15: from Old French pronostique, from Latin prognōsticum, from Greek prognōstikon, from progignōskein to know in advance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for prognostically



c.1600, from Medieval Latin prognosticus, from Greek prognostikos "foreknowing," from progignoskein (see prognosis). Related: Prognostical (1580s).

Online Etymology Dictionary, © 2010 Douglas Harper

prognostically in Medicine


  1. Of, relating to, or useful in prognosis.
  2. Of or relating to prediction; predictive.
  1. A sign or symptom indicating the future course of a disease.
  2. A sign of a future happening; a portent.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.