What is the meaning of spare?

noun

• An extra component of a machine or other apparatus.
  • synonyms: spare part
• An extra car wheel and tire for a four-wheel vehicle.
  • synonyms: fifth wheel
• A score in tenpins; knocking down all ten after rolling two balls.

verb

• Refrain from harming.
  • synonyms: save
• Save or relieve from an experience or action.
  • usage: "I'll spare you from having to apologize formally"
• Give up what is not strictly needed.
  • usage: "he asked if they could spare one of their horses to speed his journey"
  • synonyms: give up, part with, dispense with
• Use frugally or carefully.

adjective

• Thin and fit.
  • usage: "the spare figure of a marathon runner"; "a body kept trim by exercise"
  • synonyms: trim
• More than is needed, desired, or required.
  • usage: "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy"
  • synonyms: excess, extra, redundant, supererogatory, superfluous, supernumerary, surplus
• Not taken up by scheduled activities.
  • usage: "a free hour between classes"; "spare time on my hands"
  • synonyms: free
• Kept in reserve especially for emergency use.
  • usage: "a reserve supply of food"; "a spare tire"; "spare parts"
• Lacking in amplitude or quantity.
  • usage: "a bare livelihood"; "a scanty harvest"; "a spare diet"
  • synonyms: bare, scanty
• Lacking embellishment or ornamentation.
  • usage: "a plain hair style"; "unembellished white walls"; "functional architecture featuring stark unornamented concrete"
  • synonyms: plain, bare, unembellished, unornamented