What is the meaning of nickname?

noun

• A familiar name for a person (often a shortened version of a person's given name. )
  • usage: "Joe's mother would not use his nickname and always called him Joseph"; "Henry's nickname was Slim"
  • synonyms: moniker, cognomen, sobriquet, soubriquet, byname
• A descriptive name for a place or thing.
  • usage: "the nickname for the U. S. Constitution is `Old Ironsides'"

verb

• Give a nickname to.
  • synonyms: dub