tētehi
1. (determiner) one, a, an, a certain - variation used in Western dialects of tētahi.
(Te Kākano Textbook (Ed. 2): 58;)
He whakamihi tēnei i te pai o te tangata, i te pai rānei o ngāna mahi, i te pai rānei o tētehi āhuatanga (HKKT 2011:14). / This is praise for a person's good qualities, for his/her good actions or for another fine attribute.
See also tētahi