chance event

Từ điển WordNet v3.1 - WordNet Dictionary

noun

anything that happens suddenly or by chance without an apparent cause
- winning the lottery was a happy accident
- the pregnancy was a stroke of bad luck
- it was due to an accident or fortuity
• Syn:
accident, stroke, fortuity
• Derivationally related forms:
accidental (for: accident)
• Hypernyms:
happening, occurrence, occurrent, natural event
• Hyponyms:
hap, break, good luck, happy chance, coincidence,
happenstance, lottery