IPA: /nɒnəˈkɜːrəns/
KK: /nɑnəˈkɜrənss/
The state of not happening or taking place.
The nonoccurrence of rain this summer has affected the crops.
Nonoccurrence → It is formed from "non-" (meaning not) and "occurrence" (from Latin "occurrere", meaning to happen or occur). The word "nonoccurrence" means the state of not happening or not occurring.
Think of 'not' ('non-') and something that 'happens' ('occurrence') — that's why nonoccurrence means something that does not happen.