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coincidence
in
Funny in Farsi
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I, too, had been sad at Farid's departure, but my sorrow soon faded—not coincidentally, with the receipt of a package from him.†
p. 3.4
"What a coincidence!" she said.†
p. 65.1

coincidence = a situation where things happened at the same time by chance even though it was unlikely
Call it coincidence, but the job offers started coming in.†
p. 65.7
Perhaps it's the same kind of coincidence that keeps African Americans from getting cabs in New York.†
p. 65.7 *
The cerebral approach worked on all of my father's swimming students, most of whom, not coincidentally, grew up to be engineers.†
p. 70.1

Definitions:

(1) (coincidence)
a situation where two things happened at the same time or in the same way by chance even though it was unlikely
(2) (meaning too rare to warrant focus)
Much more rarely coincidence can refer to things coinciding (occurring or operating at the same place or time). For example:
- the coincidence of a target and cross hairs
- the coincidence of entangled particles in quantum physics