What is the meaning of decline?

noun

• Change toward something smaller or lower.
  • synonyms: diminution
• A condition inferior to an earlier condition; a gradual falling off from a better state.
  • synonyms: declination
• A gradual decrease; as of stored charge or current.
  • synonyms: decay
• A downward slope or bend.
  • synonyms: descent, declivity, fall, declination, declension, downslope

verb

• Grow worse.
  • usage: "Conditions in the slum worsened"
  • synonyms: worsen
• Refuse to accept.
  • usage: "He refused my offer of hospitality"
  • synonyms: refuse, reject, pass up, turn down
• Show unwillingness towards.
  • usage: "he declined to join the group on a hike"
  • synonyms: refuse
• Grow smaller.
  • usage: "Interest in the project waned"
  • synonyms: go down, wane
• Go down.
  • usage: "The roof declines here"
• Go down in value.
  • usage: "the stock market corrected"; "prices slumped"
  • synonyms: slump, correct
• (v.) ().