What is the meaning of much?

noun

• A great amount or extent.
  • usage: "they did much for humanity"

adjective

• Quantifier used with mass nouns. ( great in quantity or degree or extent)
  • usage: "not much rain"; "much affection"; "much grain is in storage"

adverb

• To a great degree or extent.
  • usage: "she's much better now"
• Very.
  • usage: "he was much annoyed"
• To a very great degree or extent.
  • usage: "I feel a lot better"; "we enjoyed ourselves very much"; "she was very much interested"; "this would help a great deal"
  • synonyms: a lot, lots, a good deal, a great deal, very much
• Degree adverb used before a noun phrase. ( for all practical purposes but not completely)
  • usage: "much the same thing happened every time"; "practically everything in Hinduism is the manifestation of a god"
  • synonyms: practically
• Frequently or in great quantities.
  • usage: "I don't drink much"; "I don't travel much"
  • synonyms: a great deal, often