- The point at which parallel lines recede, receding from an observer seem to converge.
- 1884, Wm. M. Thornton, "Construction of Perspective Projections," The Annals of Mathematics, vol. 1, no 1, p. 13,
- :These formulae . . . give for the of a set of parallel lines whose common azimuth is Î± and declivity Î´: Î·=d tan Î±, Î¶=d tan Î´ sec Î±.
- 2003, Sally B. Donnelly, "http://www.time.com/time/magazine/article/0,9171,1005525,00.html The Need for Speed," Time, 25 Aug.,
- :It hit 100 m.p.h. with ease and sped toward the down Highway 93A.
- The situation in which, place where, or point in time when some object or phenomenon is no longer observable or notable.
- 1762, Samuel Dunn, "Some Observations of the Planet Venus, on the Disk of the Sun, June 6th, 1761," Philosophical Transactions (1683-1775), vol. 52, p. 192,
- :At 8h 35' 4", the least dent possible, quite black, appeared in the sun's limb. And at 8h 35' 6", the limb was restored to its perfect form, there having been a small trembling light, between the narrow watery border of Venus and the of contact in the sun's limb for these two seconds of time.
- 1923, "http://www.time.com/time/magazine/article/0,9171,715912,00.html Tuberculosis at Bay," Time, 25 June,
- :It might cut the tuberculosis deathrate to the .
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