The Collaborative International Dictionary of English v.0.48:

Coextend \Co`ex*tend\, v. t. [imp. & p. p. Coextended; p. pr.
   & vb. n. Coextending.]
   To extend through the same space or time with another; to
   extend to the same degree.
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         According to which the least body may be coextended
         with the greatest.                       --Boyle.
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         Has your English language one single word that is
         coextended through all these significations? --Bentley.
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