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Adjective accidental has 3 senses
accidental, adventitious - associated by chance and not an integral part; "poetry is something to which words are the accidental, not by any means the essential form"- Frederick W. Robertson; "they had to decide whether his misconduct was adventitious or the result of a flaw in his character"Antonyms:  intrinsic, intrinsical (indirect, via extrinsic)
 
accidental, casual, chance - occurring or appearing or singled out by chance; "their accidental meeting led to a renewal of their friendship"; "seek help from casual passers-by"; "a casual meeting"; "a chance occurrence"Antonym:  planned (indirect, via unplanned)
 
accidental, inadvertent - without intention (especially resulting from heedless action); "with an inadvertent gesture she swept the vase off the table"; "accidental poisoning"; "an accidental shooting"Antonym:  intended (indirect, via unintended)
 
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