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Definitions of accidental:

noun:   a musical notation that makes a note sharp or flat or natural although that is not part of the key signature
adjective:   without intention (especially resulting from heedless action)
Example: "Accidental poisoning"

adjective:   associated by chance and not an integral part
Example: "Poetry is something to which words are the accidental, not by any means the essential form- Frederick W. Robertson"

adjective:   occurring or appearing or singled out by chance
Example: "Their accidental meeting led to a renewal of their friendship"

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Alternative Terms
casual chance contingent fluky fortuitous inadvertent odd surprise-expect double-sharp accidental-album vagrancy-biology accidental-music accident intended methadone-aftercare ghost-word appointment intentional ground-fault serendipity coincidence coincidental concomitant traumatic-injury plan

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