nĩrĩo

rel. pron./conj.

1. that is where, that is when, it is what (cl. 5 emphatic relative)

Example: "90: ithaa rĩmwe na nuthu nĩrĩo mũbira ũthakagwo ndagĩka mĩrongo kenda." — 90: One and a half hours is when the forest is burned making ninety.