Reserve wine
Reserve wine is wine of a higher quality than usual, or a wine that has been aged before being sold, or both. Traditionally, winemakers would "reserve" some of their best wine rather than sell it immediately, coining the term. In some countries the use of the term "reserve", ""reserva"" or ""riserva"" is regulated, but in many places it is not. Sometimes, reserve wine originates from the best vineyards, or the best barrels, making it more special. Additionally, reserve wines may be made in a style suited to longer aging periods. However, in regions where the use is not  regulated the presence of the term "reserve" on a wine label may be nothing but a marketing strategy. Indeed, in the case of one of the largest-selling premium wines, Kendall-Jackson Chardonnay, every bottle produced is "Vintner's Reserve". To indicate a traditional reserve wine, Kendall-Jackson uses the term "Grand Reserve". Like the term "old vines", "reserve" traditionally indicates a wine that is special, or at least different in flavor or aging potential. The presence of a non-reserve bottling with a producer that also sells reserve wine makes it more likely that "reserve" is being used in  its traditional sense. Partly because of the often vague meaning of "reserve", many wineries produce named cuvées instead. Typically these are reserve wines in the traditional meaning of the word. Reserva in Iberia. In Portugal and Spain, reserva is a regulated term controlled by law, at least ensuring that reserve wines get some additional ageing. In practice it is very difficult to regulate quality, so the term primarily deals with ageing and alcoholic strength. In Portuguese and Spanish wines, the requirements varies between regions, but typically, when used on a label "Reserva" means that the wine was aged for at  least three years in the cask and bottle, at least one of which must have been in the cask. Those that have been aged for five years (two in cask, three in bottle) or more are labelled . Gran Reservas are intended to be made only in exceptional vintages, but this is up to the producer. In Portugal the term indicates that the wine has an alcohol level of at least 0.5 percent above the regional minimum, and that it was made from a rated vintage. Reserve wine in Champagne. In the production of "non-vintage" Champagne, a certain amount of  aged still wine is used for blending with still wine of the youngest vintage, before this blended base wine undergoes second fermentation in bottle to become sparkling Champagne. This aged still wine is called reserve wine, and this practice is meant to ensure that a certain Champagne house's non-vintage product has a consistent style over the years. Since the reserve wine is used in the production process, it is never bottled and sold as it is, but the proportion and age of the reserve wine is often seen as one of the indicators of the quality of a  Champagne and the producer's level of ambition. Austrian DACs. In the Austrian Districtus Austriae Controllatus (DAC) system, most DACs have an additional "Reserve" designation for a wine which has slightly more strict requirements. German Cabinet. Before the 1971 German wine law, a term corresponding to reserve wine existed in "kabinett", sometimes written as "Kabinettwein". In 1971, the similar-sounding term "Kabinett" was instead introduced as the lowest level of the "Prädikatswein" category, i.e., with a completely different meaning. Therefore, in the present German wine classification no legally defined term corresponding to reserve wine exists.