For·tu·i·tous a.
1. Happening by chance; coming or occuring unexpectedly, or without any known cause; chance; as, the fortuitous concourse of atoms.
It was from causes seemingly fortuitous . . . that all the mighty effects of the Reformation flowed. --Robertson.
So as to throw a glancing and fortuitous light upon the whole. --Hazlitt.
2. LAw Happening independently of human will or means of foresight; resulting from unavoidable physical causes.
Syn: -- Accidental; casual; contingent; incidental. See Accidental.
-- For*tu*i*tous*ly, adv. -- For*tu*i*tous*ness, n.
◄ ►
fortuitousness
n : the quality of happening accidentally and by lucky chance