Amid ongoing campus protests, and in the wake of a federal inquiry, 39 Australian universities have agreed to a definition of antisemitism to be adopted on campuses nationwide. The definition declares that criticism of Israel can, under some circumstances, be seen as antisemitic. But what are those circumstances? That is being debated on campuses around the world, where definitions like this are seen on one hand as necessary to protect Jewish students, and on the other as a way silencing criticism of Israel.