Dreizehnten

Dreizehnten is the dative singular form of the German ordinal number dreizehnter, meaning the thirteenth. In German, ordinals decline to agree with the noun they modify, and dreizehnten appears in contexts where the noun is in the dative case. It is commonly found with masculine or neuter nouns, especially in date- and time-related expressions.

In practice, dreizehnten is frequently seen in phrases such as am dreizehnten Tag or am dreizehnten Dezember, where it modifies the noun and the whole phrase denotes a specific position in time. Another example is dem dreizehnten Tag, which uses the same form in a different syntactic context. The exact ending of an ordinal adjective depends on case, gender, and number, so dreizehnten is one of several inflected forms of the same numeral.

Etymology and usage notes: dreizechten derives from the combination of drei (three) and zehnter (suffix for ordinal numbers, meaning -teenth). The form discussed here is most common in masculine or neuter dative contexts and in fixed calendar expressions.

See also: dreizehnter (the base masculine nominative form), other German ordinal forms such as erste, zweite, dritte, and general rules for the declension of ordinal numbers in German.

In summary, dreizehnten is the dative singular inflection of the thirteenth ordinal used with masculine or neuter nouns, and it frequently appears in date and time expressions such as am dreizehnten Dezember or dem dreizehnten Tag.