Fortuity (noun)

1. The quality of being accidental or chance.
2. A chance event or occurrence.

Origin:

Late latin fortuitus, from latin fortus 'strong, fortunate'.

Examples:

1. The fortuity of finding a wallet filled with money on the sidewalk was a welcome surprise.
2. The scientist attributed his success to hard work, not to any fortuity.
3. The fortuity of being in the right place at the right time had a profound impact on the writer's life.
4. The fortuity of winning the lottery changed the retiree's life overnight.
5. The fortuity of surviving the crash was a miracle, and gave the pilot a newfound appreciation for life.