Definitions of substantial:

• adjective:   having substance or capable of being treated as fact; not imaginary

  Example: "The substantial world"

• adjective:   being the essence or essential element of a thing

  Example: "Substantial equivalents"

• adjective:   fairly large

  Example: "Won by a substantial margin"

• adjective:   of good quality and condition; solidly built

  Example: "Several substantial timber buildings"

• adjective:   providing abundant nourishment

  Example: "Ate a substantial breakfast"