What do a.m. and p.m. stand for?

principal point

noun, Optics.
the point where a principal plane intersects the axis.
Origin of principal point
1695-1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for principal point
  • One principal point of difference, looking ahead, is the cost of state pensions.
  • The entire case below and the principal point in this appeal concern the attorney-client agreement.
  • It serves as the principal point of contact for economic development issues and activities.
  • The contractor shall designate a principal point of contact for technical issues.
  • principal point of contact with client for all technical, management, and cost issues.
principal point in Medicine

principal point n.
One of the two points in an optical system where the axis is cut by the two principal planes. Lines drawn from these to corresponding points on the object and the image will be parallel.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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