Rātapu
1. (noun) Sunday.
(Te Kākano Textbook (Ed. 2): 30;)
He mea tika kia puta he inoi i roto i ngā karakia Māori katoa i ia Rātapu, i ia Rātapu (TKO 1/12/1917:13). / It's appropriate that prayers are expressed in all Māori services each Sunday.
See also wiki