Definition from Wiktionary, the free dictionary
From French évincer, from Latin ēvincere, present active infinitive of ēvincō (“conquer entirely, prevail over; prove exhaustively”), from ē- (short form of ex- (intensive prefix)) + vincō (“conquer”).
- (transitive) To show or demonstrate clearly; to manifest.
- Common sense and experience must and will evince the truth of this.
- 1661, Robert Boyle, The Sceptical Chymist, London: J.M. Dent & New York: E.P. Dutton, Everyman's Library, 1911, p. 26, 
- For you will find in the progress of our dispute, that I had some reason to question the very way of probation imployed both by peripatetics and chymists, to evince the being and number of the elements.
- 1813, John Gabriel Stedman, Narrative of a Five Years' Expedition, Vol. 1, London: J.Johnson, Chapter III, p. 66, 
- To evince the absurdity of that prejudice which considers human creatures as brutes merely because they differ from ourselves in colour, I must beg leave to mention a few of the principal ceremonies that attended the ratification of this peace.
- 1815, Mungo Park, Travels in the Interior of Africa, Cassell: 1893, Chapter VI, 
- ‘That unless all the people of Kasson would embrace the Mohammedan religion, and evince their conversion by saying eleven public prayers, he, the king of Foota-Torra, could not possibly stand neuter in the present contest, but would certainly join his arms to those of Kajaaga.’
- 1922, James Joyce, Ulysses, Penguin, 1992, p. 400,
- Quite an excellent repast consisting of rashers and eggs, fried steak and onions, done to a nicety, delicious hot breakfast rolls and invigorating tea had been considerately provided by the authorities for the consumption of the central figure of the tragedy who was in capital spirits when prepared for death and evinced the keenest interest in the proceedings from beginning to end […]
- 1925, DuBose Heyward, Porgy, London: Jonathan Cape, 1928, pp. 89-90, 
- As the game proceeded it became evident that Porgy's luck was with him; he was the most consistent winner, and Sportin' Life was bearing most of the burden. But the mulatto was too good a gambler to evince any discomfiture.
- 1973, Oliver Sacks, Awakenings, New York: Vintage, 1999, p. 169,
- When Mrs C. described this to me the next day she shuddered all over, but also evinced, in her manner and choice of words, an unmistakable relish.
- 1992, Adam Thorpe, Ulverton, New York: Farrar, Straus & Giroux, 1994, p. 239,
- Bare reportage cannot convey the deep hatred sometimes evinced between men through the simplest address.
show or demonstrate clearly