twentieth
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twentieth
Indicates position 20 in a sequence. As an ordinal number, it is always used with an adjectival ending (e.g. zwanzigste, zwanzigster, zwanzigstes).
Sie feiert heute ihren zwanzigsten Geburtstag.
She is celebrating her twentieth birthday today.
Ordinal numbers from 20 onward are formed by adding the ending '-ste' to the cardinal number. This rule applies to all numbers up to 99, for example: einundzwanzigste (twenty-first), dreißigste (thirtieth), vierzigste (fortieth).
Wir wohnen im einundzwanzigsten Stock.
We live on the twenty-first floor.
With dates, the ordinal number is used with 'am' and always takes the ending '-sten'. This applies to all ordinal numbers.
Mein Geburtstag ist am zwanzigsten März.
My birthday is on the twentieth of March.
The word 'zwanzigst-' behaves like a normal adjective. It comes before a noun, and its ending (-e, -er, -es, -en) changes depending on the article, gender, and case of the noun.
Das ist schon der zwanzigste Anruf heute.
That is already the twentieth call today.
