What is the definition for Sherry wine?

Sherry is one of the most famous dessert wines. It is produced in Spain. 

Sherry evolved into its near-present-day form in southern Spain possibly as late as the early 1800s.

In Spain, the designation Sherry is used as a geographically appellation. It is restricted to wines produced in and around Jerez de la Frontera in Andalucía.

Sherry is considered one of the nest wines and is produced mainly for export. Sherry is a fortified wine and a blend. The special characteristics of Sherry are governed by the climate, soil and the process of vinification. 

The wine is produced by the shippers rather than by individual growers, although the shippers now own large vineyards themselves. The smaller growers are therefore only interested in the wine up to the pressing of the grapes. From then on the shipper takes over.

There are two main varieties of grapes to make Sherry: Palomino and Pedro Ximenez.

The defining characteristics of Sherry is that it is purposely oxidized, making it high in acetaldehyde, which is the result of the reaction of ethanol and oxygen.

This gives Sherry wines their distinctive roasted nut aroma. The flavor of Sherry is produced during the aging process so, like sparkling wines, a fairly neutral wine is desired as a base for Sherry.
What is the definition for Sherry wine?