fortuitousfor‧tu‧i‧tous /fɔːˈtjuːɪtəs $ fɔːrˈtuː-/ adjective formal 
Word Origin
The meeting with Jack was fortuitous.► see thesaurus at lucky—fortuitously adverb
Word OriginWORD ORIGINfortuitous
ExamplesOrigin:
1600-1700 Latin fortuitus, from fors ‘chance, luck’EXAMPLES FROM OTHER DICTIONARIES
Thesaurus- A fortuitous fire destroyed all evidence of his wrongdoing.
- a fortuitous meeting
- After all, the meeting with Jack was fortuitous.
- Ironically enough, his main field experience occurred as a fortuitous consequence of the First World War.
- Is this fortuitous timing or what?
- Keeping that gig proved fortuitous for Reynolds.
- Now you can debate for ever the fortuitous terms of this loan.
- She was also helped by a fortuitous circumstance.
- Social scientists take it as axiomatic that our dally lives are not entirely fortuitous.
THESAURUS► lucky
happening by chance, especially in a way that has a good result: happening because of good luck, or bringing you good luck: · a lucky guess· Seven is considered a lucky number.· It’s lucky that I’ve got some spare keys.· Italy got a lucky goal in the last five minutes of the game.· ‘How did you know he’d be there?’ ‘It was a lucky guess.’
► fortunate happening because of good luck. Fortunate is more formal than lucky: · It was extremely fortunate that there was no one in the building when the bomb went off.· I’m in the fortunate position of doing a job I love.· Some plants actually prefer a lot of shade, which is fortunate for gardeners choosing plants for gloomy corners.
► it’s a good thing (that) (also it’s a good job (that) British English) spoken used when saying that there would have been problems if something had not happened: · It’s a good thing that you brought an umbrella with you.· It’s a good job I’m here to help.
► miraculous extremely lucky in a way that is almost unbelievable: · A teenager had a miraculous escape last night when the car she was travelling in overturned.· The doctor gave her a month to live but she made a miraculous recovery.· It was miraculous that no one was seriously injured in the accident.
► fortuitous formal happening because of good luck: · a fortuitous decision· a fortuitous coincidence· It was fortuitous that no one else was hurt.
► a fluke informal something that happens by chance, not because of skill or good judgment: · The goal was a fluke.· By a fluke, he managed to get the question right.
► be in the right place at the right time used when saying that someone is lucky and the situation is right for them: · Making money from buying property is easy – you just have to be in the right place at the right time.
Longman Language Activatorhappening by chance► chance: chance meeting/remark/discovery etc a meeting etc that happens unexpectedly and was not planned or arranged: · Their friendship was the result of a chance meeting.· A chance encounter at the conference gave him the opportunity to tell the professor about his work.· Wilson hoped his chance discovery would benefit poor families in developing nations.
► accidental happening by chance, without being planned or intended, especially in a way that has a bad result : · Are you insured against accidental damage to your property?· A system of valves limits accidental releases of the substance.
► fortuitous formal happening by chance, especially in a way that has a good result: · A fortuitous fire destroyed all evidence of his wrongdoing.
The meeting with Jack was fortuitous.► see thesaurus at lucky—fortuitously adverb