The Collaborative International Dictionary
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.
According to which the least body may be coextended
with the greatest.
Has your English language one single word that is
coextended through all these significations?
vb. (context ambitransitive English) To extend along with another.