nōna
1. belonging to him or her, hers - used when the possessor did not, or does not, have control of the relationship or was subordinate, passive or inferior to what was/is possessed.
(Te Kākano Textbook (Ed. 2): 54-56, 140-141; Te Kākano Study Guide (Ed. 1): 27; Te Pihinga Textbook (Ed. 2): 23-24;)
2. while he/she was, as a result.
(Te Kōhure Textbook (Ed. 2): 80;)
Nōna i te kura, ka tīmata ia ki te ako i te reo Wīwī. / While she was at school she began learning French.