Etymology
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fortuitous (adj.)

1650s, from Latin fortuitus "happening by chance, casual, accidental," from forte "by chance," ablative of fors "chance" (related to fortuna; see fortune). It means "accidental, undesigned" not "fortunate." Earlier in this sense was fortuit (late 14c.), from French. Related: Fortuitously; fortuitousness.

updated on January 13, 2013

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Definitions of fortuitous from WordNet

fortuitous (adj.)
having no cause or apparent cause;
fortuitous encounters--strange accidents of fortune
Synonyms: causeless / uncaused
fortuitous (adj.)
occurring by happy chance;
profits were enhanced by a fortuitous drop in the cost of raw materials
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.