(medicine) Any unanticipated or unusual event in a medical setting which results in death or serious physical injury to a person or persons, specifically including limb loss or gross motor function.

plural of event horizon

(taxonomy) a moment when the evolutional lineage splits, starting history of a new species.

(finance) A significant default on a financial instrument or some other financial occurrence, such as bankruptcy, restructuring, repudiation, or moratorium, or failure to pay some other obligation, such as taxes.

(cosmology, astronomy) An occurrence which causes the end of the universe or which destroys the planet earth; a global cataclysm.

The marketing discipline focused on face-to-face interaction via trade shows, corporate meetings, and other events.

at any rate, anyhow

(idiomatic, euphemistic) The birth of a baby. / (idiomatic, sometimes humorous or ironical) An occurrence or occasion which is particularly noteworthy and enjoyable.

A transmitter encodes data by producing a signal which is a continuous stream of signalling events each which has sufficient information for the receiver to recover the original data. Just like a quantum leap is the smallest measurable leap, a signalling event is the smallest possible amount of signal that the receiver needs to recover the original data without error.

(idiomatic) A deviation from the expected course of events.