ABV

Alcohol by volume.  It is the measure of the amount of alcohol in a given liquid.  It is calculated by measuring the liquids specific gravities at different times of the brewing process.

three-tier system

Simply put, the three-tier system was put into place after prohibition by the government.  It consists of producers, distributors, and retailers.   The producers make the beer, distributors buy it from the producers and sell it wholesale, and the retailers sell it for a profit.  

abbey beers

Abbey beers are a type of beer usually associated with Trappist monks. In many cases these aren’t really trappist beers but are brewed similarly. Much like champagne is sparkling wine if made outside of Champagne, abbey beer is beer brewed outside of a monastery.

wort

/?w?rt/ is the liquid extracted from the mashing process during the brewing of beer or whisky. Wort contains the sugars that will be fermented by the brewing yeast to produce alcohol. Production[edit] The first step in wort production is to make malt from dried, sprouted barley.