Demi-Sec: Designates a medium-sweet wine, though the term—which translates literally to half-dry—is potentially confusing. Most often used for Champagne or other sparkling wines, the term also appears on semi-sweet wines from the Loire Valley and other French regions.
Demi-Sec (Champagne): Has a dosage level that yields 32 to 50 g/l of residual sugar. In Champagne, the scale from driest to sweetest is: Brut Nature, Extra Brut, Brut, Extra-Dry (or Extra-Sec), Dry (or Sec), Demi-Sec and Doux.
Dosage: In bottle-fermented sparkling wines, a small amount of wine (usually mixed with sugar) that is added back to the bottle once the yeast sediment that collects in the neck of the bottle is disgorged. Also known as liqueur d'expedition.
Residual Sugar: Unfermented grape sugar in a finished wine.