The term 'neighbouring' can be defined by several crossword solutions, including 'NEARBY' (6 letters), 'ADJACENT' (8 letters), 'surrounding' (11 letters), 'ADJOINING' (9 letters), and 'CONTIGUOUS' (10 letters). All of these words refer to being close to or next to something else. 'NEARBY' implies proximity, while 'ADJACENT' means being side-by-side with something else. 'Surrounding' and 'ADJOINING' both refer to being close to something else, but 'surrounding' implies that the object is completely surrounded by something else, while 'ADJOINING' implies that the two objects are connected in some way. Finally, 'CONTIGUOUS' means that two objects are touching each other.