[fawr-kast, -kahst, fohr-]
verb (used with object), forecast or forecasted, forecasting.
to predict (a future condition or occurrence); calculate in advance: to forecast a heavy snowfall; to forecast lower interest rates.
to serve as a prediction of; foreshadow.
to contrive or plan beforehand; prearrange.
verb (used without object), forecast or forecasted, forecasting.
to conjecture beforehand; make a prediction.
to plan or arrange beforehand.
a prediction, especially as to the weather.
a conjecture as to something in the future.
the act, practice, or faculty of forecasting.
Archaic. foresight in planning.

1350–1400; Middle English (noun) plan. See fore-, cast1

forecastable, adjective
forecaster, noun
reforecast, verb (used with object), reforecast or reforecasted, reforecasting.
unforecast, adjective
unforecasted, adjective

1. foretell, anticipate. See predict. 3. project. 4, 7. guess, estimate. 9. forethought, prescience. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
forecast (ˈfɔːˌkɑːst)
vb , -casts, -casting, -cast, -casted
1.  to predict or calculate (weather, events, etc), in advance
2.  (tr) to serve as an early indication of
3.  (tr) to plan in advance
4.  a statement of probable future weather conditions calculated from meteorological data
5.  a prophecy or prediction
6.  the practice or power of forecasting

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "to scheme," from fore "before" + casten "contrive." Meaning "predict events" first attested late 15c. Related: Forecasted; forecasting.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But while earthquake prediction isn't yet possible and may never be, so-called
  earthquake forecasting has been making strides.
Most weather forecasters believe that accurate forecasting more than two weeks
  into the future will always be impossible.
The back of the card features practical tips relating to avalanche forecasting.
Even the best academic minds are often poor at forecasting specific demand, yet
  technical training is often highly specialized.
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