Definition of "thereof" []

• Of or concerning this, that, or it. (adverb)
• From that cause or origin; therefrom. (adverb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "a house, the latter accidental, (1391) the former, if altered, make another building; the latter, though altered, the building is the same: therefore where we have in the text “the forms thereof,” the Septuagint read ὑποστασιν αὐτοῦ, — _the substance thereof_."
• "Then was another book opened, and they saw the title thereof to be The Knight of the Cross."
• "Resolved, That it do pass; that the title thereof be changed; that it be called "An Act," and that it be sent to the House of Representatives."