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bore. 1  A hole or passage made by or as if by use of a drill. 2  A hollow, usually cylindrical chamber or barrel, as of a firearm. 3  The interior diameter of a hole, tube, or cylinder. 4  The caliber of a firearm. 5  A drilling tool.
Bore (engine) The Bore or cylinder bore is a part of a piston engine. The bore also represents the size, in terms of diameter, of the cylinder in which a piston travels. The value of a cylinders bore, and stroke, is used to establish the displacement of an engine. The term bore can also be applied to the bore of a locomotive cylinder or steam engine pistons.