Definition of "extant"

During the whole time of his abode in the university he generally spent thirteen hours of the day in study; by which assiduity besides an exact dispatch of the whole course of philosophy, he read over in a manner all classic authors that are extant […]

1661, John Fell, The Life of the most learned, reverend and pious Dr. H. Hammond‎

This English Nation, will it get to know the meaning of its strange new Today? Is there sense enough extant, discoverable anywhere or anyhow, in our united twenty-seven million heads to discern the same; valour enough in our twenty-seven million hearts to dare and do the bidding thereof?

1843 April, Thomas Carlyle, chapter II, in Past and Present, American edition, Boston, Mass.: Charles C[offin] Little and James Brown, published 1843, book I (Proem)

There are many narrow-gauge systems still extant.

1948 May and June, J. Macartney Robbins, “A Railway Tour of Ireland”, in Railway Magazine, page 150

I reckon that this one Duke of Weimar did more for the Culture of his Nation than all the English Dukes and Duces now extant, or that were extant since Henry the Eighth gave them the Church Lands to eat, have done for theirs! […]

1843 April, Thomas Carlyle, chapter VI, in Past and Present, American edition, Boston, Mass.: Charles C[offin] Little and James Brown, published 1843, book IV (Horoscope)

[W]hereas in ſmall fragments or plates, the Ice, though it ſink not to the bottom of the water, will oftentimes ſink so low in it, as ſcarce to leave any part evidently extant above the ſurface of the water, in vaſt quantities of Ice, that extancy is ſometimes ſo conſpicuous, that Navigators in their Voyages to Iſland, Greenland, and other frozen Regions, complain of meeting with lumps, or rather floating rocks of Ice, as high as their main Maſts.

1663, Robert Boyle, “Title IX. Experiments in Consort, Touching the Bubbles from which the Levity of Ice is Supposed to Proceed.”, in New Experiments and Observations Touching Cold, or, An Experimental History of Cold, Begun. […], London: […] Richard Davis, […], published 1683, paragraph 1, page 95