Interment is the placing of a corpse in a grave. If a loved one dies, you need to make arrangements for the interment so that people can bid the deceased farewell.
Interment comes from root words meaning "to place inside," and in this case it's the placing of someone inside the earth, for burial. The Egyptian Pyramids are landmarks of very extravagant interment. At the Chinese Emperor Qin's interment, he had an army of warriors made out of terra cotta buried with him, in case he needed to fight in the afterlife.