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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.
Wiktionary(0.00 / 0 votes)Rate this definition: boresight(Noun) The optical axis of a directional antenna. Boresight. Boresight is the adjustments made to an optical firearm sight or iron sights, to align the firearm barrel and sights.