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The Collaborative International Dictionary
Interjoining

Interjoin \In`ter*join"\, v. t. [imp. & p. p. Interjoined; p. pr. & vb. n. Interjoining.] [Pref. inter + join.] To join mutually; to unite. [R.]
--Shak.

Wiktionary
interjoining

vb. (present participle of interjoin English)