bye in WordNet English dictionary

1. a farewell remark
   "they said their good-byes"
   adieu  adios  arrivederci  auf wiedersehen  au revoir  bye  bye-bye  cheerio  good-by  goodby  good-bye  goodbye  good day  sayonara  so long 
   
2. you advance to the next round in a tournament without playing an opponent
   "he had a bye in the first round"
   bye  pass