What is the meaning of outline?

noun

• The line that appears to bound an object.
  • synonyms: lineation
• A sketchy summary of the main points of an argument or theory.
  • synonyms: synopsis, abstract, precis
• A schematic or preliminary plan.
  • synonyms: schema, scheme

verb

• Describe roughly or briefly or give the main points or summary of.
  • usage: "sketch the outline of the book"; "outline his ideas"
  • synonyms: sketch, adumbrate
• Draw up an outline or sketch for something.
  • usage: "draft a speech"
  • synonyms: draft
• Trace the shape of.
  • synonyms: delineate, limn