What is the meaning of inaugural?

noun

• An address delivered at an inaugural ceremony (especially by a United States president.
  • synonyms: inaugural address
• The ceremonial induction into a position.
  • usage: "the new president obviously enjoyed his inauguration"
  • synonyms: inauguration

adjective

• Occurring at or characteristic of a formal investiture or induction.
  • usage: "the President's inaugural address"; "an inaugural ball"
• Serving to set in motion.
  • usage: "the magazine's inaugural issue"; "the initiative phase in the negotiations"; "an initiatory step toward a treaty"; "his first (or maiden) speech in Congress"; "the liner's maiden voyage"
  • synonyms: initiative, initiatory, first, maiden