| blood-alcohol concentration: the percentage of alcohol in the bloodstream: under the laws of most states, a BAC of 0.10 is the legal definition of intoxication, although a few states use a slightly lower percentage, as 0.08. |
| BAC abbr. blood alcohol concentration |
| blood alcohol concentration n. Abbr. BAC The concentration of alcohol in the blood, expressed as the weight of alcohol in a fixed volume of blood and used as a measure of the degree of intoxication in an individual. The concentration depends on body weight, the quantity and rate of alcohol ingestion, and the rates of alcohol absorption and metabolism. Also called blood alcohol level. |
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