perspection

plural perspections

1. countableuncountablecontemplation; scrutiny
2. countablerareuncountableperspective

   Select pairs of triangles perspective from each point and such that the axes of perspection will be the lines of the figure. Show that the configuration can be regarded as made up of a complete 4-point and a complete 4-line.

   1962, Roy Martin Winger, An introduction to projective geometry, page 104

   1 more example

   Now this set of twelve triangles has the following remarkable property — any two triangles in the same row are six-fold perspective; any two triangles in the same column are four-fold perspective with three centers of perspection on a line […]

   1931, American Journal of Mathematics, page 340

3. countablerareuncountableperspicuity

   […] he never spent his ammunition in useless parade, but tried on the proper moment, with the keenest perspection, to make his attack with success, which ever crowned his endeavours.

   1790, The Gentleman's Magazine, volume 68, page 671