noun, plural prognoses [prog-noh-seez] .
Medicine/Medical. a forecasting of the probable course and outcome of a disease, especially of the chances of recovery.
a forecast or prognostication.

1645–55; < Late Latin < Greek prógnōsis foreknowledge. See pro-2, gnosis

diagnosis, prognosis. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prognosis (prɒɡˈnəʊsɪs)
n , pl -noses
1.  med
 a.  a prediction of the course or outcome of a disease or disorder
 b.  the chances of recovery from a disease
2.  any forecast or prediction
[C17: via Latin from Greek: knowledge beforehand]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1655, "forecast of the probable course of a disease," from L.L. prognosis, from Gk. prognosis "foreknowledge," from progignoskein "come to know beforehand," from pro- "before" + gignoskein "come to know" (see gnostic).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

prognosis prog·no·sis (prŏg-nō'sĭs)
n. pl. prog·no·ses (-sēz)

  1. A prediction of the probable course and outcome of a disease.

  2. The likelihood of recovery from a disease.

prog'nos·ti'cian (-nŏs-tĭsh'ən) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
prognosis [(prog-noh-sis)]

A medical prediction of the future course of a disease and the chance for recovery.

Note: Prognosis is often used as a general term for predicting the unfolding of events: “The governor said that the prognosis for the state's financial future is bleak.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
While staff have observed some improvement, the fish's prognosis is not yet
If the accommodation is justified then it is the prognosis of utter despair.
We actually have an almost identical situation at my house, and the prognosis
  isn't good.
The prognosis for the giant jumping rat may be better than expected, but it is
  still uncertain.
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