The word "genitive" is correct and usable in written English.
It is a type of noun case that shows possession, like the possessive "apostrophe s" ('s). For example, you can use it in the sentence, "It was John's genitive construction."
Media in Latin has the genitive form mediorum, but we don't say "the tendency of the mediorum to cover the sensational at the expense of the worthy makes me sick".
These would include the nominative (for the subject of a sentence), the accusative (for its object) and the genitive (to indicate possession).The difficulty is compounded if a linguist is not fluent in the language he is studying.
Later, spellings like lov'd or o'er are common.As in those 17th-century examples and much later the apostrophe is often absent from the genitive 's.
Thus, in Britain is found the genitive (possessive form) Catotigirni, which in Old Welsh gives Cattegirn, and in Ireland the genitive Dovatuci exists, which in Old Irish gives Dubthaich.
Nouns occurred in three cases (nominative, genitive, and accusative), three numbers (singular, dual, and plural), and two genders (masculine and feminine); the feminine was distinguished from the masculine by the addition of the suffix -t or -at to the stem.
In both Latin and Common Germanic the Angles' name was Angli, later mutated in Old English to Engle (nominative) and Engla (genitive).
For nouns and adjectives these inflectional elements indicate gender (masculine or feminine), number (singular, plural, and in some languages, dual), and, in several of the older languages, case (nominative, accusative, or genitive).
In the dual, the cases that were semantically close to each other were represented by a single form (nominative-accusative-vocative, instrumental-dative, genitive-locative).
Early Indo-Aryan also used various case forms of action nouns in the capacity of what are generally called infinitives e.g., dative singular -tave (dā-tave 'to give'), and ablative-genitive singular -tos (dā-tos), both from a noun in -tu, which also supplies the accusative singular -tum (dā-tum).
An unusual characteristic of the Mongolian languages is the possibility of double cases, as in Classical Mongolian ger-t-eče 'from [at] the house'house-[dative-locative]-[ablativeive]'), eke-yin-dür 'to/at mother's'mother-[genitive]-[dative-locativeive]').
An example is the nominative ʾakbar-u 'greatest' and the accusative/genitive ʾakbar-a.
