Both Alfonso and Hubert are correct. K'iuic means both "Plaza" and "Market".
It could also be generally glossed as "the center of town" since it can be modified ("k'iwikil") to indicate an urbanite / a person that lives in the center of town.
[see Victoria Bricker, Eleuterio Po'ot Yah and Ofelia Dzul de Po'ot (1998)]
-Dave