A conventional unit of sales for many items, varying with the item and over time. A case of wine, for example, is traditionally twelve 750-milliliter bottles. The word comes from the Latin capsa, a chest
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}