Definition of Excusable
Admitting of excuse or palliation. As used in the law, this word implies that the act or omission spoken of is on its face unlawful, wrong, or liable to entail loss or disadvantage on the person chargeable, but that the circumstances attending it were such as to constitute a legal “excuse” for it, that is, a legal reason for withholding or foregoing the punishment, liability, or disadvantage which otherwise would follow. See Justification; Legal excuse.
That's the definition of Excusable in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.