noun
1.
absence of positive plan or intent
we stopped there by accident
Synonyms: chance, fortuity, hap, luck
Related Word: fluke, fortune, hazard
Contrasted words: design, premeditation
Antonyms: intent
2.
a chance event bringing injury, loss, or distress
the school was closed by an accident to the heating system
Synonyms: casualty, misadventure, mischance, mishap
Related Word: calamity, catastrophe, disaster, tragedy; misfortune; chance, destiny, fate, kismet
Contrasted words: foreordination, predestination