What does fortuitous mean?
"Fortuitous" is an adjective describing events that happen by chance rather than design. In its strict, traditional sense it says nothing about whether an outcome is good or bad — a fortuitous meeting is simply an unplanned one. In practice, however, the word has drifted toward implying a happy accident: a chance encounter that leads to opportunity, or an unintended error that produces a brilliant result. This dual character makes it one of the more debated words in modern usage, since careful writers distinguish it from "fortunate," which unambiguously means lucky. Derived from Latin roots relating to chance and fortune, it entered English in the seventeenth century and remains a staple of formal and journalistic prose. It pairs naturally with words like "encounter" and "circumstances," and its adverbial form "fortuitously" and noun form "fortuity" extend the same idea. For anyone describing coincidence with precision, "fortuitous" offers a word whose very ambiguity carries a lesson in linguistic history.
adjectiveHappening by chance rather than by design or intention; occurring unexpectedly and often luckily.
- Happening or arising by chance, without deliberate planning; accidental.
- (By extension in modern usage) Happening luckily or fortunately as a result of chance — a sense widely used though often criticized as a shift from the original meaning.
"Their meeting at the airport was entirely fortuitous, yet it changed the course of both their careers."
"The discovery of penicillin owed much to a fortuitous contamination of Fleming's culture plate."
"A fortuitous delay meant we missed the meeting that would have cost us the contract — and gained a client instead."
"Fortuitous" doesn't actually mean lucky — it means random. The happy outcome is optional; the coincidence is the point.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fortuitous
"Fortuitous" derives from the Latin "fortuitus," meaning "happening by chance," itself rooted in "fors," the Latin term for chance or luck and personified as the goddess Fortuna. It entered English in the early seventeenth century, carried by the period's appetite for Latin-derived vocabulary. The same Latin root gave English its wider family of fortune-related words, including "fortune," "fortunate," and "misfortune." Over time the word's meaning broadened from pure chance toward chance with a fortunate outcome, a development that continues to divide usage commentators today.
Related word forms
How fortuitous is actually used
Formal to neutral register, common in written English and journalism. Traditionally, "fortuitous" referred only to chance, not luck; many style guides still note that using it to mean simply "lucky" is a contested usage, though it is now widespread and accepted by most dictionaries.
Easily confused with fortuitous
"Fortunate" means lucky or favored by good luck, while "fortuitous" strictly means happening by chance, whether the outcome is good or bad.