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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.
In navigation bearing may refer , depending on the context , to any of : ( A ) the direction or course of motion itself ; ( B ) the direction of a distant object relative to the current course ( or the  change  in course that would be needed to get to that distant object ) ; or ( C ) , the angle away from North of a distant point as observed at ...