A more thorough explanation:

Definition: Demi (dem-ee) is a French word that means half or the half. It is usually used as a combining form, as in demi-sangue.

Examples:

• Demi-sangue: This is a French term that means half-blood. It is often used to describe a person or animal that is of mixed race or breed.
• Demi-glace: This is a French sauce that is made by simmering beef or veal bones with vegetables and herbs until it is reduced by half. It is used as a base for many other sauces.

The examples illustrate how the term demi is used to describe something that is half or partially something else. In demi-sangue, it describes a person or animal that is of mixed race or breed, while in demi-glace, it describes a sauce that is made by reducing a mixture by half.