Blood libel refers to the false accusation, originating in 12th-century medieval Europe, that Jews murder Christian children to use their blood in religious rituals. The accusation has no basis in fact, but it proved extraordinarily durable, providing a pretext for massacres, pogroms, and expulsions of Jewish communities across Europe for centuries, and earning a formal Roman Catholic repudiation only in 1965.

In Uncomfortable Conversations with a Jew, the blood libel is cited as one of the most instructive examples of how antisemitic myths operate: Rooted in nothing, immunized against evidence, and capable of reactivation across vastly different historical contexts, as demonstrated by its reappearance on social media in the immediate hours following the October 7th Hamas attacks.

BDS—an acronym for “Boycott, Divestment, and Sanctions”—is an international campaign launched in 2005 calling for economic and political pressure on Israel, modeled on the anti-apartheid boycott of South Africa and presenting itself as a human rights initiative on behalf of the Palestinian people. While its surface messaging frames it in the language of international law and civil society advocacy, Noa draws attention to the stated goals of its own leadership, which include not a negotiated two-state resolution but the elimination of Israel as a Jewish state entirely—a position that goes considerably beyond any specific policy objection.

Noa further identifies the BDS movement as a descendant of the Arab League’s 1945 boycott of Jewish goods, placing it within the longer history of organized efforts to delegitimize and dissolve the Jewish state, and making it a key example of the book’s argument that anti-Zionism, in its most prevalent contemporary institutional forms, functions as a vehicle for antisemitism rather than as a neutral political position.

The Jewish Diaspora refers to the dispersion of Jewish communities outside of their ancestral homeland of Israel, a process that began in earnest with the Babylonian exile of 586 BCE and accelerated through successive waves of conquest, expulsion, and persecution over the following millennia, producing Jewish communities across Europe, North Africa, the Middle East, Asia, and eventually the Americas. The four major Diaspora communities—Ashkenazi Jews of Central and Eastern European descent; Sephardic Jews descending from those expelled from Spain in 1492; Mizrahi Jews from North Africa and the broader Middle East; and Beta Israel Jews from Ethiopia—each developed distinct cultural practices, languages, and physical characteristics, which is why the global Jewish population bears no uniform appearance.

In Uncomfortable Conversations with a Jew, the Diaspora is foundational to several of the book’s central arguments, providing the historical backdrop for the discussion of Jewish whiteness, the origins of Jewish involvement in banking and finance, and the cultural resilience that allowed Jewish identity to survive across centuries without a permanent homeland or institutional center.

An ethno-religion is a religious tradition so thoroughly interwoven with the ethnic, cultural, and ancestral identity of a particular people that membership in the religious community and membership in the ethnic group are understood as largely coextensive—one can belong to the people without actively practicing the religion, and yet the religion carries the history, language, and cultural memory of the people alongside its theological content. Judaism is the paradigmatic example of this category, which is what allows an atheist to be fully and unambiguously Jewish in a way that an atheist cannot be fully Christian or Muslim.

The concept of ethno-religion is introduced in Chapter 2 as the single most important corrective to the widespread misunderstanding of what Jewish identity is, and virtually every subsequent chapter builds on it, from the discussion of Jewish racial classification to the argument about why Israel functions as the national expression of a people rather than merely the political preference of a religious group.

The Holocaust (often called the Shoah in Jewish contexts) refers to the systematic, state-sponsored persecution and murder of six million Jewish people by the Nazi German government and its collaborators during World War II, representing approximately two-thirds of the entire Jewish population of Europe and constituting the most extensive genocide in recorded history. The word “genocide” itself was coined specifically in response to the Holocaust, as the scale of the destruction exceeded any existing legal or conceptual category. The Nazi regime’s meticulous documentation of its own crimes ensures that it is among the most thoroughly evidenced events in modern history, a fact that makes the subsequent rise of Holocaust denial and distortion all the more alarming.

In Uncomfortable Conversations with a Jew, the Holocaust occupies two full chapters and functions as both a historical account and a warning. Noa insists that the Holocaust was not a freak accident but the terminal destination of a recognizable, escalating pattern.

Tikkun olam is a Hebrew phrase meaning “repair of the world.” In Jewish tradition it refers to the ethical obligation to act in ways that improve the condition of society and alleviate suffering—a mandate rooted in the Torah and elaborated through centuries of rabbinic commentary into one of the foundational principles of Jewish moral and communal life. It is distinct from simple charity or philanthropy in that it carries a sense of cosmic obligation: The world as it exists is broken and incomplete, and the repair of that brokenness through righteous action is not optional but commanded.

Tikkun olam is one of Judaism’s four foundational pillars—alongside religion, peoplehood, and nationhood—and it serves as part of the book’s explanation for the historically disproportionate Jewish involvement in social justice movements, civil rights advocacy, and humanitarian work, helping to answer the question of why a community representing such a small fraction of the global population has left such an outsized mark on the moral and intellectual landscape of the modern world.