The Collaborative International Dictionary of English v.0.48:

Beverage \Bev"er*age\, n. [OF. bevrage, F. breuvage, fr. beivre
   to drink, fr. L. bibere. Cf. Bib, v. t., Poison,
   Potable.]
   1. Liquid for drinking; drink; -- usually applied to drink
      artificially prepared and of an agreeable flavor; as, an
      intoxicating beverage.
      [1913 Webster]

            He knew no beverage but the flowing stream.
                                                  --Thomson.
      [1913 Webster]

   2. Specifically, a name applied to various kinds of drink.
      [1913 Webster]

   3. A treat, or drink money. [Slang]
      [1913 Webster]

WordNet (r) 3.0 (2006):

beverage
    n 1: any liquid suitable for drinking; "may I take your beverage
         order?" [syn: beverage, drink, drinkable, potable]

Moby Thesaurus II by Grady Ward, 1.0:

99 Moby Thesaurus words for "beverage":
   John Barleycorn, ade, alcohol, alcoholic beverage, alcoholic drink,
   ambrosia, aqua vitae, ardent spirits, beef tea, birch beer, blood,
   booze, bouillon, brew, buttermilk, chicory, chocolate milk, cider,
   cocktail, cocoa, coffee, cola, drink, drinkable, egg cream, eggnog,
   espresso, fluid, fluid extract, fluid mechanics, frappe, frosted,
   frosted shake, fruit juice, ginger ale, ginger beer, grape juice,
   grapefruit juice, grog, hard liquor, hydraulics, hydrogeology,
   ice-cream soda, iced coffee, iced tea, inebriant, intoxicant,
   intoxicating liquor, juice, koumiss, latex, lemonade, limeade,
   liquid, liquid extract, liquor, little brown jug, malt, milk,
   mineral water, mocha, nectar, orangeade, phosphate, pop, potable,
   potation, punch, punch bowl, root beer, root beer float, rum, sap,
   schnapps, seltzer, semiliquid, shake, social lubricant, soda,
   soda pop, soda water, soft drink, spirits, spring water,
   strong drink, strong waters, tea, the Demon Rum, the bottle,
   the cup, the flowing bowl, the luscious liquor, the ruddy cup,
   tisane, tonic, toxicant, water, water of life, whey