prompt coincidence

https://doi.org/10.1351/goldbook.P04878
The occurrence of two or more events separated by a time interval which is less than a specified small value.
Source:
PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1537 (https://doi.org/10.1351/pac198254081533)