What is the meaning of stilt?

noun

• A column of wood or steel or concrete that is driven into the ground to provide support for a structure.
  • synonyms: pile, spile, piling
• One of two stout poles with foot rests in the middle; used for walking high above the ground.
  • usage: "he was so tall I thought he was on stilts"
• Long-legged three-toed wading bird of brackish marshes of Australia.
  • synonyms: Australian stilt
• Long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons.
  • synonyms: stiltbird, longlegs, long-legs, stilt plover, Himantopus stilt