バグ（bug）

コンポーネントまたはシステムに要求された機能が実現できない原因となる、コンポーネントまたはシステムに含まれる不備。たとえば、不正なステートメントまたはデータ定義。実行中に欠陥に遭遇した場合、コンポーネントまたはシステムの故障を引き起こす。

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