As an example, we consider Spanish, a language with two gender categories: "natural" vs "grammatical". "Natural" gender can be masculine or feminine, while "grammatical" gender can be masculine, feminine or neutral. This third, or "neutral" gender is reserved for abstract concepts derived from adjectives: such as , ("that which is good/bad"). Natural gender refers to the biological sex of most animals and people, while grammatical gender refers to certain acoustic characteristics (the sounds at the end, or beginning) of a noun. Among other lexical items, the definite article changes its form according this categorization. In the singular, the article is: (masculine), and (feminine). Thus, in "natural gender", nouns referring to sexed beings who are male beings carry the masculine article, and female beings the feminine article (agreement).