Why does the noun Index have the article der?
This noun follows no general suffix rule — its gender is part of the core vocabulary you simply learn alongside the word.
Declension table for German noun Index
How it changes across the four cases.
| Case | Definite | Indefinite | Negative |
|---|---|---|---|
| Nominativ | der Index | ein Index | kein Index |
| Akkusativ | den Index | einen Index | keinen Index |
| Dativ | dem Index | einem Index | keinem Index |
| Genitiv | des Indexes | eines Indexes | keines Indexes |
| Nominativ | die Indizes | Indizes | keine Indizes |
| Akkusativ | die Indizes | Indizes | keine Indizes |
| Dativ | den Indizes | Indizes | keinen Indizes |
| Genitiv | der Indizes | Indizes | keiner Indizes |
Examples in context
Real sentences using Index in different cases.
| Case | Definite | Indefinite | Negative |
|---|---|---|---|
| Nominativ | Der aktuelle Index ist hoch.The current index is high. | Ein neuer Index erscheint bald.A new index appears soon. | Kein falscher Index hilft uns.No false index helps us. |
| Akkusativ | Ich sehe den roten Index.I see the red index. | Wir brauchen einen klaren Index.We need a clear index. | Er hat keinen alten Index.He has no old index. |
| Dativ | Ich folge dem grünen Index.I follow the green index. | Er arbeitet mit einem neuen Index.He works with a new index. | Sie hilft keinem alten Index.She helps no old index. |
| Genitiv | Der Wert des hochen Indexes steigt.The value of the high index rises. | Die Daten eines neuen Indexes fehlen.The data of a new index are missing. | Die Farbe keines alten Indexes ist klar.The color of no old index is clear. |
| Nominativ | Die wichtigen Indizes steigen.The important indices are rising. | Gute Indizes sind selten.Good indices are rare. | Keine schlechten Indizes stören uns.No bad indices bother us. |
| Akkusativ | Sie lesen die neuen Indizes.They read the new indices. | Wir finden interessante Indizes.We find interesting indices. | Ich sehe keine falschen Indizes.I see no false indices. |
| Dativ | Wir vertrauen den stabilen Indizes.We trust the stable indices. | Er spricht von guten Indizes.He talks about good indices. | Sie gibt keinen schlechten Indizes.She gives no bad indices. |
| Genitiv | Die Analyse der aktuellen Indizes ist wichtig.The analysis of the current indices is important. | Die Bedeutung guter Indizes ist bekannt.The meaning of good indices is known. | Die Herkunft keiner falschen Indizes ist klar.The origin of no false indices is clear. |
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Frequently asked questions
Everything you might wonder about der, die, das — and the Der Artikel app.
Is it der, die, or das Index?
It is der Index. In German, every noun has a grammatical gender, and Index is masculine. You should always learn the article together with the noun to ensure your German grammar is correct.
What is the plural of der Index?
The plural form of der Index is die Indizes. In German, regardless of the singular gender, all plural nouns use the definite article “die.”
What does der Index mean in English?
The German word der Index translates to “index” in English.
How do you decline der Index?
Like all German nouns, Index changes its article depending on the case. In the singular, the forms are:
- Nominativ: der Index
- Akkusativ: den Index
- Dativ: dem Index
- Genitiv: des Indexes
These changes are necessary because German uses cases to indicate the noun’s role in a sentence (such as the subject or object). Knowing these forms allows you to build grammatically correct sentences.
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