assault and battery, Related but distinct crimes. Battery is the unlawful application of physical force to another; assault is an attempt to commit battery or an act that may reasonably cause fear of imminent battery. With manslaughter and murder (see homicide), these concepts are articulated to protect against rude and undesired physical contact or the threat of it. Battery requires no minimum degree of force, nor does it need to be applied directly; administering poison and transmitting a disease may both be battery. Accidents and ordinary negligence are not, nor is reasonable force used in the performance of duty (e.g., by a police officer). See also rape.
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