Longman Dictionary of Contemporary English homepage

accidental

 adjective
     
ac‧ci‧den‧tal
happening without being planned or intended [≠ deliberate]:
an accidental discharge of toxic waste
Buy an insurance policy that covers accidental damage.
—accidentally adverb:
I accidentally locked myself out of the house.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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