De or het fiattering?

The correct Dutch article is:

de fiattering

Rule Words ending in -ing: almost always de. See the rule

How to use fiattering

the fiatteringde fiattering
this fiatteringdeze fiattering
that fiatteringdie fiattering
our fiatteringonze fiattering
your fiatteringjouw fiattering
every fiatteringelke fiattering
which fiattering?welke fiattering?
a big fiattering / the big fiatteringeen grote fiattering, de grote fiattering