Wiktionary
n. That which exits (the flux out of a defined zone) vb. (context intransitive English) To exit out of a defined zone.
Usage examples of "outflux".
Braddock was still loose, but the outflux gave Braddock less and less to work with, and Braddock now had very little control over anything mechanical.
In the future the influx will only be births, the outflux only emigration to Joy Hall.
She thought that she could probably walk right out of the bailey and across the drawbridge, lowered now for the constant influx and outflux of traffic, pedestrian and vehicular alike, but too much was at stake for her to take a chance of being recognized and stopped.
The collieries were short of able hands, with the outflux of volunteers.
There will be an equatorial brightening of the sun, essentially, an outflux of energy that will bathe the orbital plane of Earth, and the other planets.