'parallel existence' is a correct and usable phrase in written English.
Generally, it is used to refer to two or more distinct realities that are happening or existing at the same time. For example, "The two realities of his dual life created a parallel existence, one that eventually tore his family apart."
It was almost a parallel existence to Amy's.
A Borough of Churches This parallel existence is particularly felt in Brooklyn, the borough of 13,000 churches.
All these years, I've led a parallel existence — I'm a lawyer, by the way, specializing in divorce.
But even as he was writing those books, Nabokov had a parallel existence as a self-taught expert on butterflies.
The parallel existence of the EC and the parliamentary register, each with its own rules, ensures confusion.
Now, here was the name again, on a bottle of shampoo, where it had been leading a parallel existence for more than 30 years.
It did not put paid to one of football's most fascinating parallel existences.
Her serial and parallel existences take her through two brutal world wars and well into the 1960s.
Sari Nusseibeh, a Palestinian philosopher who wrote his own powerful autobiography of growing up in Jerusalem in the same era, "Once Upon a Country," said in that book's opening that it was upon reading Mr. Oz's volume that he was struck by the parallel existences of Jews and Palestinian Arabs of the time.
Though a defining part of L.A. culture, car clubs can be insular worlds, with lowriders, drifting racers and car audio obsessives leading parallel existences on the same Southern California roads.
A discovery was made that will send shockwaves through the science community – the existence of a parallel universe, visible only to people who don't like Jeremy Corbyn.
