Happenstance means a random or chance occurrence, something that happens by luck or coincidence without any particular plan or intention. Full definition
I walked for a mile before finding Father on the top of a dune, where we walked across another half - mile of sub-quicksand; a kind of happenstance of the tides which left a consistency of wet mushroom. (notesfromtheroad.com)
You don't have to accept ANYBODY's findings until they have been confirmed to your satisfaction — by you, your designate, or just happenstance by someone whose judgement you happen to trust. (climateaudit.org)