The dictionary is sourced from the Oxford dictionary. Or is this another ostracize Apple poe's law posts? They're getting hard to detect.

I assume it's a non serious posting about the fact that this word is indeed in Apple's default dictionary, which many of us can immediately verify with a three-finger tap: Esquivalience

It's especially fun because my popup shows the fake definition at the top, and the wikipedia explanation below it :) - not sure if that's because of my settings or if it is the default behaviour.