In general, in English this means grape harvest or vintage. Especially for dessert and sparkling wines(sparkling wine, champagne) it is common to name a vintage wine (i.e. not a blend from different years) in this way. In France a vintage champagne is called Millésime. Other products are also usually blended from different vintages (or sites or qualities). In addition, so-called vintages are also produced (often only in the best years) and are explicitly named so on the label. This is common, for example, for the wine types port, sherry and vin doux naturel, as well as for the brandies armagnac and cognac. Vintage Wine means "exquisite" or "outstanding" wine quality.
For me, Lexicon from wein.plus is the most comprehensive and best source of information about wine currently available.
Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)