What is the meaning of hi?

noun

• An expression of greeting.
  • usage: "every morning they exchanged polite hellos"
  • synonyms: hello, hullo, howdy, how-do-you-do
• A state in the United States in the central Pacific on the Hawaiian Islands.
  • synonyms: Hawaii, Hawai'i, Aloha State
• Czechoslovakian religious reformer who anticipated the Reformation; he questioned the infallibility of the Catholic Church was excommunicated (1409) for attacking the corruption of the clergy; he was burned at the stake (1372-1415. ).
  • synonyms: Huss, John Huss, Hus, Jan Hus