What is the meaning of Tlachtli?

A ceremonial ball game once played by the Aztecs; evolved into the ulama game.

The high-walled court in which this game was played.

(it is) a ritual sport in which two teams of players strike a solid rubber ball with the hips within a masonry ballcourt.

(it is) a ballcourt for the ritual practice of this sport.

Source: wiktionary.org