The Collaborative International Dictionary of English v.0.48:

Forego \Fore*go"\, v. t. [imp. Forewent 2; p. p. Foregone
   (?; 115); p. pr. & vb. n. Foregoing.] [See Forgo.]
   1. To quit; to relinquish; to leave.
      [1913 Webster]

            Stay at the third cup, or forego the place.
                                                  --Herbert.
      [1913 Webster]

   2. To relinquish the enjoyment or advantage of; to give up;
      to resign; to renounce; -- said of a thing already
      enjoyed, or of one within reach, or anticipated.
      [1913 Webster]

            All my patrimony,,
            If need be, I am ready to forego.     --Milton.
      [1913 Webster]

            Thy lovers must their promised heaven forego.
                                                  --Keble.
      [1913 Webster]

            [He] never forewent an opportunity of honest profit.
                                                  --R. L.
                                                  Stevenson.
      [1913 Webster]

   Note: Forgo is the better spelling etymologically, but the
         word has been confused with Forego, to go before.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

foregone \foregone\ adj.
   past; -- used of time; as, foregone summers. Contrassted to
   present.

   Syn: bygone, bypast, departed, gone.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

foregone
    adj 1: well in the past; former; "bygone days"; "dreams of
           foregone times"; "sweet memories of gone summers";
           "relics of a departed era" [syn: bygone, bypast,
           departed, foregone, gone]