While the chosen definition for "dispensation" can refer to Mr. Brown's giving of towels and singlets to encourage the villagers to attend his school, the definition intended here is "a specific system by which something is administered," which in the example sentence is "the white man's government."
There were many men and women in Umuofia who did not feel as strongly as Okonkwo about the new dispensation.
An obsolete definition of "palaver" is "a conference between European explorers and representatives of local populations, especially in Africa"--this is what the District Commissioner should've meant by his use of the word. However, his lack of respect for the Ibos suggests that he also connects to the chosen definition.
Three days later the District Commissioner sent his sweet-tongued messenger to the leaders of Umuofia asking them to meet him in his headquarters. That also was not strange. He often asked them to hold such palavers, as he called them.
The definition makes the act of appeasing the white man seem like the right and happy thing to do. But missing in the definition are the words "by giving what is demanded." Achebe makes his view of this appeasement clear when he describes the court messengers increasing the fine to profit off it.
On the morning after the village crier's appeal the men of Umuofia met in the marketplace and decided to collect without delay two hundred and fifty bags of cowries to appease the white man.
an action that is vicious or vile; an action that arouses disgust or abhorrence
Okonkwo spent his life proving he's not like his father, but he chooses a death that's an abomination, which is a word that also describes Unoka's death from the swelling. Unoka was carried to the Evil Forest and left there to die and rot. Okonkwo's body has to be cut down by strangers and buried like a dog. Knowing this, Okonkwo could have chosen his method of suicide to defy both the clan that didn't support him and the British who wanted to hang him for killing their messenger.
"It is an abomination for a man to take his own life. It is an offense against the Earth, and a man who commits it will not be buried by his clansmen. His body is evil, and only strangers may touch it. That is why we ask your people to bring him down, because you are strangers."