1. the quality or state of being accidental; the fact of occurring by chance rather than by design or intention
Usage: formal; abstract noun

Examples

• The accidentalness of their meeting at the airport led to a lifelong friendship.
• She emphasized the accidentalness of the error in her report.
• The accidentalness of the discovery made it all the more remarkable.
• He questioned the accidentalness of the timing, suspecting it was planned.
• The accidentalness of the outcome surprised everyone involved.