happening by chance or unexpectedly or unintentionally ; "with an inadvertent gesture she swept the vase off the table"; "accidental poisoning"; "an accidental shooting"偶然に、予期せずにまたは意図せずに起きる偶発的
例:an accidental shooting 偶発的銃撃
a musical notation that makes a note sharp or flat or natural although that is not part of the key signatureシャープ、フラット、またはナチュラルを示すが調号ではない音楽記号臨時記号