I think I discovered the source of the rampant use of the term “halvening” instead of ‘halving’ to describe the 50% decrease in Bitcoin minted block rewards every four (4) years:

For the rest of 2019 and first half of 2020, bitcoiners anxiously await to see if the consensus comes true. In the words of Mr. Tepper regarding the 2016 bitcoin halving, Fitz said, “It's Halvening!!!”