ABSTRACT In his book A Great and Noble Scheme (2005), historian John Mack Faragher explains that the 1755–63 Acadian deportation can be termed “ethnic cleansing,” following contemporary United Nations and scholarly usage of the expression. In this paper, instead of addressing the terms of contemporary UN or scholarship, as Faragher does, to see which terms can be used for the Acadian tragedy, I provide a terminological history of the Acadian tragedy. This terminological history studies the terms used for the Acadian tragedy since the eighteenth century until the early twentieth century and shows how they recur in the mid-twentieth century discussions on genocide. First, I investigate Edmund Burke’s treatment of the Acadian tragedy seen as resulting from acts of destroying, rooting out, and extirpating, and the Abbot Raynal using terms for the tragedy such as embarking, transporting, driving away (later deporting), destroying, perishing, depopulating, and, indirectly, crime against humanity. I also focus on the nineteenth-century account of the Acadian tragedy by Catherine Reed Williams, who expanded Raynal with notions of barbarity, banishment, expulsion, extermination, and moral shock, and on others after her who brought terms for Acadians such as annihilation, atrocity, evacuation, and clearing. Second, I highlight Acadian memory in the 1950s genocide debate in Washington (DC) and how the terminological history of the Acadian tragedy appears in a document Raphael Lemkin had on Acadians. I also explain how Lemkin, unknowingly or not, rearticulated in publications and texts and found in his research the terms already used for Acadians as he addressed his genocide concept.