Origin of fortuitous
Many object to the use of fortuitous to mean simply “fortunate” and insist that it should be limited to its original sense of “accidental.” In modern standard use, however, fortuitous almost always carries the senses both of accident or chance and luck or fortune. It is infrequently used in its sense of “accidental” without the suggestion of good luck, and even less frequently in the sense “lucky” without at least a suggestion of accident or chance: A fortuitous encounter with a former schoolmate led to a new and successful career for the artist.
Examples from the Web for fortuitous
“It was a fortuitous discovery,” Bruenn told The Daily Beast last week.Ebola's Roots Are 50 Times Older Than Mankind. And That Could Be the Key to Stopping It.|Michael Daly|October 20, 2014|DAILY BEAST
But all kinds of fortuitous circumstances—important people “seeing that”—led him to getting cast in Inside Llewyn Davis.‘Inside Llewyn Davis’ Star Oscar Isaac Is About to Be a Very Big Deal|Kevin Fallon|December 5, 2013|DAILY BEAST
All of which is why the juxtaposition of these two cases is fortuitous.
And 1968 was a fortuitous year to become European Champions: it was the year that defined an age.
It was a fortuitous decision, because the plaza's roof happened to be crammed with several hundred refugees.The Extinction Parade: An Original Zombie Story by Max Brooks|Max Brooks|January 14, 2011|DAILY BEAST
He knew, as well as I, that his poor average of happiness was fortuitous—that it hinged on the life of his master.
The army was a fortuitous concourse of regiments of horse and foot, each of which was the property of its colonel.
Yet we find a few fortuitous circumstances that favored his evolution.Little Journeys to the Homes of the Great - Volume 14|Elbert Hubbard
In like manner a woman may be called a fortuitous animal and produced by accident.Woman, Church & State|Matilda Joslyn Gage
It was impossible that this concurrence of circumstances could be fortuitous.Wilson's Tales of the Borders and of Scotland Volume 21|Alexander Leighton