The possessive case (abbreviated pos or poss) of a language is a grammatical case used to indicate a relationship of possession. It is not the same as the genitive case, which can express a wider range of relationships, though the two have similar meanings in many languages.
See Possession (linguistics) for a survey of the different categories of possession distinguished in languages.
The English possessive
The term "possessive case" is often used to refer to the " 's" morpheme, which is suffixed onto many nouns in English to denote possession. Calling it a case is arguably not strictly correct – some grammarians contend that this affix is actually a clitic.[nb 1] By descent, however, the English usage does stem from a case ending, Old English -es. See genitive case for details. For information on how to properly construct the possessive form, see Possessive apostrophe.
Here are some examples of the Possessive case being applied in the English language.
Deprecation in international scientific terminology
In the twentieth century, the convention of using the possessive case has changed for the eponymic naming of diseases and physical constants in English. Instead of using the possessive of the name of the person to whom it is associated, the simplest form of the word is now preferred. One example of each is Down's Syndrome, now Down Syndrome; and Avogadro's Number, now Avogadro Constant.
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