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The Collaborative International Dictionary
Principal point

Principal \Prin"ci*pal\, a. [F., from L. principalis. See Prince.]

  1. Highest in rank, authority, character, importance, or degree; most considerable or important; chief; main; as, the principal officers of a Government; the principal men of a state; the principal productions of a country; the principal arguments in a case.

    Wisdom is the principal thing.
    --Prov. iv. 7.

  2. Of or pertaining to a prince; princely. [A Latinism] [Obs.]
    --Spenser.

    Principal axis. See Axis of a curve, under Axis.

    Principal axes of a quadric (Geom.), three lines in which the principal planes of the solid intersect two and two, as in an ellipsoid.

    Principal challenge. (Law) See under Challenge.

    Principal plane. See Plane of projection (a), under Plane.

    Principal of a quadric (Geom.), three planes each of which is at right angles to the other two, and bisects all chords of the quadric perpendicular to the plane, as in an ellipsoid.

    Principal point (Persp.), the projection of the point of sight upon the plane of projection.

    Principal ray (Persp.), the line drawn through the point of sight perpendicular to the perspective plane.

    Principal section (Crystallog.), a plane passing through the optical axis of a crystal.

Wikipedia
Principal Point
For "principal point" in optics, see Cardinal point (optics). For "principal point" in computer vision, see Pinhole camera model.

Principal Point is a prominent ice-covered headland lying 4 nautical miles (7 km) east of Cape Errera and forming the southeast end of Wiencke Island, in the Palmer Archipelago. First charted by the French Antarctic Expedition under Charcot, 1903-05. The name, applied by the Argentine Antarctic Expedition, 1953–54, suggests the prominence of the feature.

Category:Headlands of the Palmer Archipelago

Usage examples of "principal point".

This fact was doubly apparent, by the rapid manner in which the battle in the forest rolled upward toward the village, and by an instant falling off in the number of their assailants, who rushed to assist in maintaining the front, and, as it now proved to be, the principal point of defense.

The principal point involved a league of all the nations that would, at the first sign of stress between any of its members, soothe and adjudicate and make war unthinkable.

The principal point of this grade is that the Probationer has a master appointed, whose experience can guide him in his work.

The principal point of the process is pressurepressure in large doses and they tried to use enormous steel retorts, made of metal of the finest quality and nine inches thick.

Spirits to be a principal point of the armour of salvation (1 Cor.

And yet that, my child, is the principal point in his whole character.