From Latin 'eventus' (outcome) — 'e-' + 'venire' (to come). Originally what comes out of a situation, now any occurrence.
A thing that happens or takes place, especially one of importance or significance; a planned public or social occasion.
From Latin 'ēventus' (outcome, result, occurrence, fortune), from 'ēvenīre' (to come out, to happen, to result, to turn out), from 'ē-/ex-' (out, forth) + 'venīre' (to come, to arrive), from PIE *gʷem- (to come, to go, to step). The Latin sense was fundamentally about outcomes — 'what comes out' of a situation, the result of a process. The broader modern sense of 'any occurrence' or 'something that happens' developed in English from the 16th century onward, diluting the original focus on consequence. PIE *gʷem- is widely attested: Sanskrit 'gam-' (to go), Greek 'bainein' (βαίνειν, to go, to walk — with the labio-velar becoming 'b'), and English 'come' itself (through Germanic, where *gʷ regularly became *kw and then simplified). Related English words from 'venīre'
In Latin, 'ēventus' meant specifically an outcome or result — what comes out at the end. This is why 'eventual' means 'in the end' and 'eventuality' means 'a possible outcome.' The modern English use of 'event' to mean any happening (not just an outcome) represents a broadening. In physics, 'event' has a precise technical meaning: a point in spacetime specified by four coordinates.