Synonym: abutting, adjacent, conterminous, contiguous, neighboring. Similar words: join in, dining, raining, whining, training, examining, retaining, remaining. Meaning: [-nɪŋ] 
adj. having a common boundary or edge; touching.
adj. having a common boundary or edge; touching. 
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(151) A light step on an adjoining staircase arrested my attention.
(152) The prioress, without adding a word, rose and entered the adjoining room, which was the hall of the chapter, and where the vocal mothers were probably assembled.
(153) Another patient in the room, observing thrashing and hearing choking noises from the adjoining bed, presses a bell push urgently to call back the nurse.
(154) It consists of a town and fortress and adjoining the Rock of Gibraltar, a mountainous promontory.
More similar words: join in, dining, raining, whining, training, examining, retaining, remaining, adjourn, join, joint, enjoin, ongoing, opening, cunning, warning, morning, burning, evening, planning, earnings, reasoning, screening, happening, lightning, glistening, concerning, meaningful, good evening, early warning.