Webster's English Dictionary

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adjoin

ad.join \*-'jo.in\ vb [ME adjoinen, fr. MF adjoindre, fr. L adjungere, fr. 
   ad-X + jungere to join - more at YOKE 1: to add or attach by joining  2: to 
   lie next to or in contact with  : to be close to or in contact with one 
   another