ad·join 
/əˈʤoɪn/ verb
ad·joins; -joined -join·ing /əˈʤoɪn/ verb of a building, room, area of land, etc. : to be next to or joined with something [+ obj] ▪ Her office adjoins the library. ▪ The two rooms adjoin each other. [no obj] ▪ The two rooms adjoin.
— adjoining adjective
▪ We reserved adjoining rooms at the hotel.
▪ We reserved adjoining rooms at the hotel.
