What is the meaning of substantial?

adjective

• Fairly large.
  • usage: "won by a substantial margin"
  • synonyms: significant
• Having a firm basis in reality and being therefore important, meaningful, or considerable.
  • usage: "substantial equivalents"
  • synonyms: substantive
• Having substance or capable of being treated as fact; not imaginary."the substantial world"; "a mere dream, neither substantial nor practical"; "most ponderous and substantial things- Shakespeare
  • synonyms: real, material
• Providing abundant nourishment.
  • usage: "a hearty meal"; "good solid food"; "ate a substantial breakfast"; "four square meals a day"
  • synonyms: hearty, satisfying, solid, square
• Of good quality and condition; solidly built.
  • usage: "a solid foundation"; "several substantial timber buildings"
  • synonyms: solid, strong