2. (modifier) repaying, paying, responding, avenging, replying.

3. (noun) revenge, vengeance, retaliation, payback, retribution, cost, price, wage, fee, payment, salary, reciprocity - an important concept concerned with the maintenance of balance and harmony in relationships between individuals and groups and order within Māori society, whether through gift exchange or as a result of hostilities between groups. It is closely linked to mana and includes reciprocation of kind deeds as well as revenge. While particular actions required a response, it was not necessary to apply utu immediately. The general principles that underlie utu are the obligations that exist between individuals and groups. If social relations are disturbed, utu is a means of restoring balance. Gift exchange, a major component of utu, created reciprocal obligations on the parties involved and established permanent and personal relationships. Traditionally utu between individuals and groups tended to escalate. Just as feasts were likely to increase in grandeur as an exchange relationship developed over time, so could reciprocal acts of vengeance intensify. Utu was not necessarily applied to the author of the affront, but affected the whole group. Thus utu could be gained through a victory over a group where only the most tenuous of links connected the source of the affront with the target of the utu. Any deleterious external influence could weaken the psychological state of the individual or group, but utu could reassert control over the influences and restore self-esteem and social standing. Suicide could even reassert control by demonstrating that one had control over one's fate, and was a way of gaining utu against a spouse or relative where direct retaliation was not possible. Such indirect utu often featured within kin groups.

(Te Kākano Textbook (Ed. 2): 48;)

4. (noun) compensation, recompense, reparation.