(countable) An event is anything that happens.
- Synonyms: happening, occurrence, incident and accident
The event of her walking into the room happened before the event of the book falling off the table, so she saw it fall.

In the event that the machine breaks, read this to know what to do.
(countable) An event is when many people come together at a time they choose for a reason or for fun.
- Synonym: function
At the event tomorrow we're going to have balloons and music.

Noun