De or het tai-chi?

The correct Dutch article is:

de tai-chi

Meaning (Dutch) een van oorsprong Chinese vechtkunst

How to use tai-chi

the tai-chide tai-chi
this tai-chideze tai-chi
that tai-chidie tai-chi
our tai-chionze tai-chi
your tai-chijouw tai-chi
every tai-chielke tai-chi
which tai-chi?welke tai-chi?
a big tai-chi / the big tai-chieen grote tai-chi, de grote tai-chi

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