late 14c., for ever; from for + ever. Often written as one word from late 17c. As a noun by 1858. Emphatic forevermore is from 1819.
no one can live forever
she took forever to write the paper
we had to wait forever and a day
forestry
foretaste
foretell
forethought
foretime
forever
forewarn
foreword
forfeit
forfeiture
forfend
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