Of or pertaining to deflection.

The difference, expressed in degrees, between the direction a magnetic compass needle points and true or astronomical north; magnetic declination.

Change in azimuth setting applying to all guns in a battery when the target moves, or when a shift is made from one target to another. Deflection change does not include the deflection difference which allows for the difference in positions of the various guns firing at the same target.

The amount that a piece in a battery is traversed toward or away from a given piece (usually the base piece) to vary the width of the sheaf.

(firearms) The adjustment of a sight, exactly parallel to the axis of the bore of the gun to which it is attached.

plural of deflection change

plural of deflection difference

(surveying) A measure of how far the direction of the local gravity field has been shifted at a certain point on the Earth by local anomalies such as nearby mountains.

plural of vertical deflection

plural of compass deflection