Related to Hawaiian ʻō- from Proto-Polynesian *koo-
kō-
- Prefix added to a number of words, often without any obvious difference in meaning between the two words.
- “kō-” in John C. Moorfield, Te Aka: Maori–English, English–Maori Dictionary and Index, 3rd edition, Longman/Pearson Education New Zealand, 2011, →ISBN.