The definition of fortuitous is happening by chance.
(adjective)An example of fortuitous is two people who meet during a storm evacuation and wind up marrying each other a few years later.
See fortuitous in Webster's New World College Dictionary
adjective
Origin: L fortuitus < forte, by chance < fors (gen. fortis), chance, luck < IE *bhtis < base *bher-, to bring > bear
Related Forms:
See fortuitous in American Heritage Dictionary 4
adjective
Origin:
Origin: Latin fortuītus; see bher-1 in Indo-European roots
.Related Forms:
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