An incident which happened not very long after that airy notion of getting aid from his uncle had been excluded, was a strong sign of the effect that might have followed any extant opportunity of gambling.
There are no more uses of "extant" in the book.
Show samples from other sources
But as you know, to do this with extant technology would have been prohibitively expensive for the average person.
Dave Eggers -- The Circle
"That was one of only five extant copies!" he moaned.