What is the meaning of bye?

noun

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