There are many greetings or mihi used in Māori. Here are some that are commonly used:
Informal:
Kia ora koe - greeting one person
Kia ora kōrua - hi you two
Kia ora koutou - hi to you and your friends
Kia ora tātou - hi to all of us / the people
Ka kite anō - see you again
Mā te wā - farewell until sometime in the future
Formal:
Tena koe - greeting one person
Tena kōrua - greetings to both of you
Tena koutou - greetings to you and your friends
E noho rā - goodbye to someone staying
Haere rā - goodbye to someone leaving
Informal:
Kia ora koe - greeting one person
Kia ora kōrua - hi you two
Kia ora koutou - hi to you and your friends
Kia ora tātou - hi to all of us / the people
Ka kite anō - see you again
Mā te wā - farewell until sometime in the future
Formal:
Tena koe - greeting one person
Tena kōrua - greetings to both of you
Tena koutou - greetings to you and your friends
E noho rā - goodbye to someone staying
Haere rā - goodbye to someone leaving