This is the 3900th most frequent Catalan word.
casualitat
Chance or coincidence.
Here, 'casualitat' is used to express the idea of an unexpected and unplanned occurrence.
Vaig trobar el llibre que volia per casualitat.
I found the book I wanted by chance.
In this sentence, 'casualitat' signifies a situation where events happen simultaneously or in conjunction unexpectedly.
És només una casualitat que ens hàgim trobat aquí avui.
It's just a coincidence that we met here today.
The speaker uses 'casualitat' here to refer to the concept of randomness or chance in events.