Sentence:  <WSD>"Koha</WSD>" are commonly given at the conclusion of a "powhiri" (a Maori welcome onto a "marae" (meeting place)). [Mary Anne] Salmond explains that "great pride is taken in being able to present a generous gift to the hosts." <WSD>"Koha</WSD>" that are given at the conclusion of a "powhiri" are not payments for goods or services. 
Meaning of the word marked with <WSD> tags:  A Māori tradition of reciprocal giving of gifts.