The quality of state of occurring at the same time or occupying the same space; a coincidence.
From 'coincide' (from Medieval Latin 'coincidere,' to occupy the same place together) + '-ency' (state or condition). The suffix creates an abstract noun describing the quality.
Physicists speak of 'coincidency events' in particle detectors—when two particles hit sensors simultaneously, it's statistically significant, separating real events from random noise in mountains of data.
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