happenstance

noun
UK /ˈhæpənstæns/
US /ˈhæpənstæns/

Something that happens by chance, not because anyone planned it.

By pure happenstance, I sat next to my old friend on the train.


OTHER MEANINGS

2. A chance meeting or event that was not arranged.

Their reunion at the cafe was a happy happenstance.

3. The quality of occurring without design or intention.

The discovery was a matter of happenstance rather than careful research.

4. An unexpected but fortunate turn of events.

Finding the lost keys was a lucky happenstance.