The feeling of exhausting and bliss after a long day of work, where one can sit in darkness for hours contemplating many aspects of ones life. Comes from the old greek "Oneiric" meaning "Dream".
After working over-time they grabbed a beer and felt oneir for 3h.
A made up fact that is used in an academic setting, such as presentation or essay, to further bring credence to a point the creator of the academic work is trying to make.
I had to write my essay in ChatGPT, but it wrote one with a bunch of fauxts as references