serendipity /ˌser.ənˈdɪp.ə.ti/ noun
The occurrence and development of events by chance in a happy or beneficial way.

Example sentences

  • Finding this rare book at a flea market was pure serendipity.
  • Their meeting was serendipity — they both missed the same train and started talking.
  • Science sometimes advances through serendipity rather than planned experiments.