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1. Equivalent to usual, regular, rational, or standard conditions. </dd>
2. Perpendicular. </dd>
A line measured to another line or a plane when it is perpendicular to it. A line is normal to a curve or curved surface when it is perpendicular to the tangent line or plane at the point of tangency. </dd>
3. Referring to thermal radiation properties, in a direction perpendicular to the surface. </dd>
4. The line normal, sense 2, to a surface. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use