fortuitous
Americanadjective
-
happening or produced by chance; accidental.
a fortuitous encounter.
- Synonyms:
- incidental
-
a series of fortuitous events that advanced her career.
adjective
Commonly Confused
Fortuitous has developed in sense from “happening by chance” to “happening by lucky chance” to simply “lucky, fortunate.” This development was probably influenced by the similarity of fortuitous to fortunate and perhaps to felicitous : A fortuitous late-night snowfall made for a day of great skiing. 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.
Related Words
See accidental.
Other Word Forms
Etymology
Origin of fortuitous
First recorded in 1645–55; from Latin fortuitus, fortuītus, equivalent to fortu- (u-stem base, otherwise unattested, akin to fors, genitive fortis “chance, luck”) + -itus, -ītus adjective suffix (for formation cf. gratuitous); see -ous
Explanation
Fortuitous means by chance, like a lucky accident. If you and your best friend's families happen to go on vacation to the same place at the same time, that’s a fortuitous coincidence! Something fortuitous is random like an accident, but there’s no downside. A rock falling on your head is an accident, dollar bills falling on your head is fortuitous. The meaning of fortuitous is changing from "happening by chance" to "lucky chance" because people get it mixed up with fortunate. But watch out: If you say fortuitous to mean just plain lucky without the element of chance — that's a usage error.
Vocabulary lists containing fortuitous
100 Top "SAT" Words
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300 Most Difficult "SAT" Words
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Grade 10, List 3
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Four giant tortoises—George, Shelly, Fortuitous and Pequeña—roam the property.
From The Wall Street Journal • Apr. 26, 2026
Fortuitous because Cole, who had joined forces with Arkus-Duntov, had their small-block ready for production.
From New York Times • Sep. 10, 2020
Fortuitous four for Karthik as a thick inside edge evades his leg stump and the despairing diving left-hand glove of Mark Boucher, who sees the ball trickle away for a boundary.
From BBC • May 2, 2010
Fortuitous Layoff While I gave thought to where I was going to apply from the beginning, I didn't make any decisions until after the GMAT.
From BusinessWeek • Mar. 22, 2010
Fortuitous variations are the species-producing kind, which the theory requires; continuous fluctuations constitute, in this respect, a useless type.
From Darwin and Modern Science by Seward, A. C. (Albert Charles)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
