principal point

noun

, Optics.

1. the point where a principal plane intersects the axis.

Word History and Origins

Origin of principal point¹

First recorded in 1695–1705

Example Sentences

The Hamid Karzai International Airport is the principal point of entry for foreign visitors coming to the landlocked country.

From Ozy

This is the first and principal point at which we can stanch the wastage of teaching energy that now goes on.

From Project Gutenberg

Shut in on the north by mountains, and south-west by (p. 347) the ocean, Pinar del Rio being the principal point in the district.

From Project Gutenberg

The Hellespont itself was, of course, one principal point of danger.

From Project Gutenberg

The principal point of difference is the amount of twist imparted to the cotton roving.

From Project Gutenberg

This is the principal point to be dealt with; it is here that we must make an adjustment.

From Project Gutenberg