The phrase "a previously nonexistent" is correct and usable in written English.
It can be used to describe something that did not exist before but has come into existence at a later time.
Example: "The researchers discovered a previously nonexistent species in the remote rainforest."
Alternatives: "an earlier nonexistent" or "a formerly absent".
When it transpired that this was 47% of the US population, he inadvertently created a previously nonexistent solidarity among those he set out to attack.
So the Yelp app on my iPhone was a godsend, providing a previously nonexistent opportunity to escape the tyranny of the Interstate-exit restaurant chains.
Furthermore, some practitioners defend that the requirement to use a previously nonexistent technology would actually increase the solution space or move it to a new area, while others state that more requirements make life more difficult.
For a number of ant orphan genes, it still remains unclear whether the orphan gene stems from gene losses and lineage-specific retention or from the gain of a previously nonexistent gene, for example, by de novo formation.
In other words, if there were morphogenetic limitations that determine an inverse relationship between tooth size and neurocranium volume, and if such constraints were subsequently removed, this might mean that a new, previously nonexistent combination of traits (i.e., tooth reduction and brain expansion) could arise, which would be favored later by natural selection.
The reasons given for his withdrawal include difficulties in fund-raising (Republican donors are in a foul mood these days) and shifty behavior on behalf of its seed-money donor, a Missouri-based, previously nonexistent, anonymously funded entity called Take Initiative America.
Now pilgrims can roam the entire country and a limited supply of previously nonexistent tourist visas is offered.
To an extent, the feistiness of the game was an indicator of the growing rivalry, previously nonexistent, between these two teams.
They have transformed cities. Rumbling generators outside homes and other buildings -- previously nonexistent -- and thickets of wires as dense as a jungle canopy have become as much a part of Iraq's cityscapes as blast walls and checkpoints.
This week's Riff essay by Willy Staley deals with rap lyrics and mondegreens — specifically, the previously nonexistent word "fanute," which was born from people's mishearing a verse by rapper French Montana on Rick Ross's "Stay Schemin'".
Unemployment, previously nonexistent, rose to 14 percent in the early 1990s but declined after 1994.
