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Perpendicularity
ASME Y14.5 :
Dimensioning and Tolerancing
The condition of a line element, surface, tangent plane, center plane of feature, or feature axis at an implied or specified basic 90° (perpendicular) angle relative to one or more datum planes or datum axes.
See Also:
Surface
,
Center Plane of Feature
,
Feature Axis
,
Datum
,
Datum Axis