What is the meaning of piping?

noun

• A thin strip of covered cord used to edge hems.
• A long tube made of metal or plastic that is used to carry water or oil or gas etc..
  • synonyms: pipe, pipage
• Playing a pipe or the bagpipes.

verb

• Utter a shrill cry.
  • synonyms: shriek, shrill, pipe up, pipe
• Transport by pipeline.
  • usage: "pipe oil, water, and gas into the desert"
  • synonyms: pipe
• Play on a pipe.
  • usage: "pipe a tune"
  • synonyms: pipe
• Trim with piping.
  • usage: "pipe the skirt"
  • synonyms: pipe

adverb

• Used of heat. ( extremely)
  • usage: "the casserole was piping hot"
  • synonyms: steaming