De or het agisme?

The correct Dutch article is:

het agisme

Rule Words ending in -isme: almost always het. See the rule
Meaning (Dutch) leeftijdsdiscriminatie

How to use agisme

the agismehet agisme
this agismedit agisme
that agismedat agisme
our agismeons agisme
your agismejouw agisme
every agismeelk agisme
which agisme?welk agisme?
a big agisme / the big agismeeen groot agisme, het grote agisme

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).