The side of a level or drift.

a masonry fence (as around an estate or garden); "the wall followed the road"; "he ducked behind the garden wall and waited"

a side of a building or a room or a fence

The side of a lode; the overhanging side is know as the hanging wall and the lower lying side as the footwall. The face of a longwall working or stall, commonly called coal wall. A rib of solid coal between two rooms; also, the side of an entry.

Jar sides and ends.

Three or more groups/contacts/formations line abreast/side-side.

Massive training and testing facilities in the huge central hall of the Gahreesen Training Center. You may glance at it from the Conference or Control rooms. Currently it is out of order.