principal point

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noun Optics.

the point where a principal plane intersects the axis.

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Origin of principal point

First recorded in 1695–1705

The Hamid Karzai International Airport is the principal point of entry for foreign visitors coming to the landlocked country.
Butterfly Effect: The New Sultan of Kabul?|Charu Kasturi|June 24, 2021|Ozy
The citizens of Stevens Point defeated fluoridation by a healthy margin.
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
Deep, situational, and emotional jokes based on what is relevant and has a POINT!
Trolls and Martyrdom: Je Ne Suis Pas Charlie|Arthur Chu|January 9, 2015|DAILY BEAST
To borrow an old right-wing talking point, these people are angry no matter what we do.
Harry Shearer on The Dangerous Business of Satire|Lloyd Grove|January 8, 2015|DAILY BEAST

Therefore, it is not possible for any F-35 schedule to include a video data link or infrared pointer at this point.
Pentagon Misfires in Stealth Jet Scandal|Dave Majumdar|January 8, 2015|DAILY BEAST
But the most important point I want to make is about what the press does now.
Ayaan Hirsi Ali: Our Duty Is to Keep Charlie Hebdo Alive|Ayaan Hirsi Ali|January 8, 2015|DAILY BEAST
This is the first and principal point at which we can stanch the wastage of teaching energy that now goes on.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
"The Smoker," and "Mother and Daughter," a triptych, are two of her principal pictures.
Women in the fine arts, from the Seventh Century B.C. to the Twentieth Century A.D.|Clara Erskine Clement
It is the principal waste-product of metabolism, and constitutes about one-half of all the solids excreted—about 30 gm.
A Manual of Clinical Diagnosis|James Campbell Todd
His also was the intellectual point of view, and the intellectual interest in knowledge and its deductions.
The Mediaeval Mind (Volume II of II)|Henry Osborn Taylor
Judged from this point of view only, the elasticity provided by the new law is doubtless adequate.
Readings in Money and Banking|Chester Arthur Phillips