The criminal law offense of operating a vehicle after having drunk an amount of alcohol sufficient to raise one's blood alcohol content above a legal limit, commonly referred to by the acronym DWI. Also known as driving under the influence(DUI), which, in some jurisdictions means that the driver had a lower level of intoxication than DWI, but was still impaired. In some jurisdictions, the term driving while impaired is used. n. drug 1 A chemical or organic substance used to treat a medical or...