Why is it das Kriterium?

Kriterium ends in -ium, and nouns ending in -ium are neuter: in a German dictionary, 100% of them take das.

All nouns ending in -ium
Sense 1
das

Meaning

[1] Important decision and distinction feature

[1] wichtiges Entscheidungs- und Unterscheidungsmerkmal

Examples

In the future, universities want to select the students in Germany according to their own criteria

[1] Hochschulen wollen in Deutschland zukünftig die Studierenden nach eigenen Kriterien auswählen dürfen.

Declension

1 Singular Plural
Nominativ das Kriterium die Kriterien
Genitiv des Kriteriums der Kriterien
Dativ dem Kriterium den Kriterien
Akkusativ das Kriterium die Kriterien

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary