Goodbye

from WordNet (r) 3.0 (2006)

goodbye
    n 1: a farewell remark; "they said their good-byes" [syn:
         {adieu}, {adios}, {arrivederci}, {auf wiedersehen}, {au
         revoir}, {bye}, {bye-bye}, {cheerio}, {good-by}, {goodby},
         {good-bye}, {goodbye}, {good day}, {sayonara}, {so long}]

from The Collaborative International Dictionary of English v.0.48

Good-by \Good`-by"\, Good-bye \Good`-bye"\, n. or interj. [A
   contraction of God be with ye (God be w[i^] ye, God bw' ye,
   God bwye).]
   Farewell; a form of address used at parting. See the last
   Note under {By}, prep. --Shak.
   [1913 Webster]

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