Definitions of through:

• adjective:   having finished or arrived at completion

  Example: "After the treatment, the patient is through except for follow-up"

• adverb:   throughout the entire extent

  Example: "Got soaked through in the rain"

• adverb:   from one end or side to the other

  Example: "Jealousy pierced her through"

• adverb:   over the whole distance

  Example: "This bus goes through to New York"

• adverb:   in diameter

  Example: "This cylinder measures 15 inches through"

• adverb:   from beginning to end

  Example: "Read this book through"

• adverb:   to completion

  Example: "Think this through very carefully!"