Todays word: coincidence

noun
1 [C] an occasion when two or more similar things happen at the same time, especially in a way that is unlikely and surprising:
You chose exactly the same wallpaper as us - what a coincidence!
Is it just a coincidence that the wife of the man who ran the competition won first prize?
a series of strange/amazing coincidences

2 [U] chance or luck:
Just by coincidence, I met my old school-mate again fifty years later.
[+ that] It was pure/sheer coincidence that I remembered his phone number.
By some strange coincidence, he was passing the house just when it happened.