The heraldic sense “leaping” and the sense “projecting outward” are borrowed from Latinsalientem, the accusative form of saliēns(“springing, leaping”), present participle of saliō(“leap, spring”, verb). The senses “prominent” and “pertinent” are relatively recent, and derive from the phrase salient point, which is a calque of the Latinpunctum saliēns, a translation of Aristotle's term for the embryonal heart visible in (opened) eggs, which he thought seemed to move already. Compare also the German calque der springende Punkt.
Warning me that many of the street signs were down, the youth drew for my benefit a rough but ample and painstaking sketch map of the town's salient features.
1834, George Bancroft, History of the United States of America, from the discovery of the American continent:
He [Grenville] had neither salient traits, nor general comprehensiveness of mind.
2018, James Lambert, “A multitude of ‘lishes’: The nomenclature of hybridity”, in English World-Wide, page 2:
Professionally published dictionaries do not seem to have extended coverage beyond the most frequent and salient items.
Russian forces likely accumulated a large amount of equipment for such mechanized assaults, but significant medium- to long-term constraints on Russian armored vehicle stocks will become more salient as losses grow and may force the Russian military command to rethink the benefit of continuing such intensified mechanized activity in Ukraine.
1796, Edmund Burke, A Letter from the Right Honourable Edmund Burke to a Noble Lord, on the Attacks Made upon Him and His Pension,[…], 10th edition, London:[…] J. Owen,[…], and F[rancis] and C[harles] Rivington,[…], →OCLC, page 50:
He had in himſelf a ſalient, living ſpring of generous and manly action.
1919, “General Pershing's Story”, in Americans Defending Democracy: Our Soldiers' Own Stories, World's War Stories, Inc., page 9:
On April 26 the First Division had gone into the line in the Montdidier salient on the Picardy battlefront.
1978, Jan Morris, chapter 9, in Farewell the Trumpets, New York: Harcourt Brace Jovanovich, page 193:
The battlefronts were often no more than a few hundred yards wide, and the salients never more than a few miles deep.
(geography) A protrusion of the administrative borders of a geopoliticalentity, such as a subnational entity or a sovereign state into another geopolitical entity, generally of the same administrative level.
2018 April 17, Michele Livani, Davide Scrocca, Paola Arecco, Carlo Doglioni, “Structural and Stratigraphic Control on Salient and Recess Development Along a Thrust Belt Front: The Northern Apennines (Po Plain, Italy)”, in Journal of Geophysical Research: Solid Earth, volume 123, number 5, →DOI, pages 4360-4387:
Orogenic arcs are made up by more advanced segments (salients) separated by less advanced zones (recesses) (Miser, 1932). Within salients, the critical taper is lower, the distance among thrust ramps is larger, and there may be more ramps departing from the basal décollement layer with respect to the recess areas.