fortuitous

Fortuitous describes something that happens by a happy chance rather than by intention or design. Think of it as a stroke of luck that brings a positive result, like finding exactly the right book you needed on a dusty shelf just as you were about to give up your search. While it is often used interchangeably with "fortunate," it specifically carries the nuance of being accidental or random. It is frequently used in professional or literary contexts to describe timing or encounters that seem meant to be, though they occurred purely by coincidence.
In conversation
Work meeting
Our meeting with the CEO was entirely fortuitous; he just happened to be in the elevator.
Our meeting with the CEO was entirely fortuitous; he just happened to be in the elevator.
That is incredible luck! Did you manage to pitch the project?
That is incredible luck! Did you manage to pitch the project?
Used to emphasize that a professional opportunity arose from a random, lucky encounter.
Friends chatting
I bumped into an old friend in Tokyo today. It was a completely fortuitous encounter.
I bumped into an old friend in Tokyo today. It was a completely fortuitous encounter.
That sounds like a scene from a movie.
That sounds like a scene from a movie.
Describes a social situation that feels special because it was unexpected.
Examples
The team's success was due to a fortuitous combination of circumstances.
The team's success was due to a fortuitous combination of circumstances.
It was a fortuitous discovery that led to the development of the new vaccine.
It was a fortuitous discovery that led to the development of the new vaccine.
His fortuitous arrival at the station saved him from missing the last train of the night.
His fortuitous arrival at the station saved him from missing the last train of the night.