To forecast is defined as to predict something.(verb)
An example of to forecast is a meteorologist projecting what the weather will be like over the next seven days.
The definition of a forecast is a prediction.(noun)
An example of a forecast is a report with the total dollars predicted by the sales department of how much they think they will sell in the next six months.
See forecast in Webster's New World College Dictionary
Origin: ME forecasten < fore (see fore) + casten, to contrive: see cast
See forecast in American Heritage Dictionary 4
verb fore·cast or fore·cast·ed, fore·cast·ing, fore·casts verb, transitive
Origin: Middle English forecasten, to plan beforehand
Origin: : fore-, fore-
Origin: + casten, to throw, calculate, prepare; see cast.
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