Source : Webster's Revised Unabridged Dictionary (1913)

Forever \For*ev"er\, adv. [For, prep. + ever.]
   1. Through eternity; through endless ages, eternally.

   2. At all times; always.

   Note: In England, for and ever are usually written and
         printed as two separate words; but, in the United
         States, the general practice is to make but a single
         word of them.

   {Forever and ever}, an emphatic ``forever.''

   Syn: Constantly; continually; invariably; unchangeably;
        incessantly; always; perpetually; unceasingly;
        ceaselessly; interminably; everlastingly; endlessly;
        eternally.

Source : WordNet®

forever
     adv 1: for a limitless time; "no one can live forever"; "brightly
            beams our Father's mercy from his lighthouse
            evermore"- P.P.Bliss [syn: {everlastingly}, {eternally},
             {evermore}]
     2: seemingly without interruption; often and repeatedly;
        "always looking for faults"; "it is always raining"; "he
        is forever cracking jokes"; "they are forever arguing"
        [syn: {always}]
     3: for a very long or seemingly endless time; "she took forever
        to write the paper"; "we had to wait forever and a day"
        [syn: {forever and a day}]