by coincidence meaning

• [American idiom]
  by an accidental and strange similarity; by an unplanned pair of similar events or occurrences.
  • We just happened to be in the same place at the same time by coincidence.
  • By coincidence, the circus was in town when I was there. I'm glad because I love circuses.
  
• 
  [American slang]
  by an accidental and strange similarity; by an unplanned pairing of events or occurrences.
    We just happened to be in the same place at the same time by coincidence.
    By coincidence, the circus was in town when I was there. I'm glad because I love circuses.

• coincidence:    Noun: coincidence& ...
• coincidence amplifier:    [Electronics]An am ...
• coincidence circuit:    [Electronics]See A ...

Examples

1. Quite by coincidence, Interior killed the casino within three months.
2. It made me wonder if this was just happening by coincidence,
3. By coincidence, once I saw the whole thing take place.
4. Psychologist describe this as " conditioning by coincidence ."
5. By coincidence, Weber had received a similar guitar on consignment.