Becky brought back peas, greens, and gossip from the marketplace: the British fleet was in the harbor, no, the fleet had sailed for Jamaica, no, the Congress had negotiated a peace, no, the British planned to kill us all while we slept.
Compare with "natter" in the list for Chapters 1-11--although "prattle" is used here as a noun, in its use as a verb, the two words are synonymous, with the difference that "natter" is mostly used by British speakers.
Here, "address" does not mean an actual location or the directions for finding a location (but the sense of direction is suggested in the preposition "to"). Used as a verb, it is pronounced with the stress on the second syllable instead of the first.
He bade Madam to sit on the chair she had nearly broke over my head, took a seat himself, and addressed me gravely.
In Latin, the word sounds more innocent, because "com" means "together" and "spirare" means "to breathe" so conspirators are people who breathe together. But this sense of closeness often connects to secrecy, which is usually needed for some harmful or illegal plot.
Conspirators who plotted against the American cause had been arrested all over the city and in several close-by villages.
an illegal action inciting resistance to lawful authority and tending to cause the disruption or overthrow of the government
Compare with "treason" in this list--the description of Hickey's crimes includes both sedition and treason (implied by the "treacherous correspondence" with the enemy). "Treason" usually refers to an individual's direct action, while "sedition" includes any speech or action that might provoke others to actions against their government.
“Thomas Hickey, you have been court-martialed and found guilty of the capital crimes of mutiny and sedition, of holding a treacherous correspondence with, and receiving pay from, the enemy for the most horrid and detestable purposes, and you have been sentenced to hang from the neck until dead."