**A Glossary of the Principal Terms Used in Medieval Jewish Philosophy** *A.* **A.C.** Abbreviated form of the name of Maimonides' famous work, "Moreh Nebukim," the Hebrew title of "The Guide of the Perplexed."

**Abraham ben Ezra, Abraham ibn Ezra, Abraham ben Meir ibn Ezra** (c. 1092-c. 1167). A Spanish-Jewish polymath, Hebrew poet, philosopher, grammarian, biblical commentator, physician, and astronomer. He is one of the most important figures in medieval Hebrew literature. He was born in Tudela, Navarre, and is said to have died in Rome. He traveled extensively throughout Europe, North Africa, and the Near East. His Hebrew commentaries on the Bible, which are characterized by their philosophical and linguistic insights, have had a profound influence on subsequent Jewish scholarship. He also wrote philosophical works, including "Sefer ha-Yashar" (The Book of the Righteous), in which he discusses various theological and philosophical problems. He also wrote works on astronomy, mathematics, and medicine. He was a prolific writer and his influence was widespread.

**Abraham ibn Daud, Abraham ben David Halevi ibn Daud** (c. 1110-1180). A Spanish-Jewish historian, philosopher, and astronomer. He was born in Toledo, Spain, and is the author of "Sefer ha-Qabbalah" (The Book of Tradition), a historical work that traces the lineage of Jewish scholars from ancient times to his own. He also wrote a philosophical work, "Emunah Ramah" (The Exalted Faith), in which he attempts to reconcile Jewish theology with Aristotelian philosophy. He was one of the first Jewish philosophers to systematically expound Aristotelianism in Hebrew. He was also active in scientific pursuits, particularly astronomy.

**Abstract Idea**. In philosophy, an idea that is not concrete or specific, but rather general and universal. Abstract ideas are formed by the mind through a process of generalization and abstraction from particular instances. For example, the idea of "chair" is an abstract idea, as it refers to all chairs, regardless of their specific material, color, or design. In medieval Jewish philosophy, abstract ideas were often discussed in relation to the nature of God, the intellect, and the soul.

**Action**. In philosophy, action refers to the performance of an act, or the process of doing something. In medieval Jewish philosophy, action was often contrasted with thought or contemplation. It was also discussed in relation to free will and moral responsibility.

**Actual Intellect**. In Aristotelian and medieval philosophy, the "Actual Intellect" (or "Agent Intellect") is the active principle that illuminates the mind and makes it capable of understanding. It is often identified with God or a divine emanation. In medieval Jewish philosophy, the concept of the Actual Intellect was explored by various thinkers, including Maimonides, who saw it as the source of human knowledge and spiritual perfection.

**Adversary**. In a general sense, an adversary is someone or something that opposes or resists. In religious and philosophical contexts, the term can sometimes refer to forces of evil or spiritual opposition.

**Aesthetics**. The branch of philosophy that deals with the nature of beauty and art. While not a central focus of early medieval Jewish philosophy, later thinkers engaged with aesthetic questions, particularly in relation to the interpretation of sacred texts and the creation of religious art.

**Affirmation**. In logic and philosophy, an affirmation is a statement that asserts the truth of something. It is the opposite of negation.

**Agnosticism**. The view that the existence of God or the ultimate nature of reality is unknown and perhaps unknowable. This position is generally contrary to the tenets of traditional Jewish philosophy, which emphasizes faith and reasoned belief.

**Air**. In ancient and medieval cosmology, air was considered one of the four elements. It was thought to be a subtle and pervasive substance. Its properties were discussed in relation to the natural world and its influence on human beings.

**Akiba ben Joseph, Rabbi Akiba** (c. 50-c. 135 CE). A highly influential Jewish sage and scholar. He was a leading figure in the development of rabbinic Judaism and a proponent of the Bar Kokhba revolt. His teachings and interpretations of Jewish law had a profound impact on subsequent Jewish tradition. While not strictly a philosopher in the modern sense, his exegetical methods and interpretations of scripture often touched upon philosophical themes.

**Alchemy**. An ancient practice that sought to transform base metals into gold and to find a universal elixir. While often associated with mystical and esoteric traditions, alchemical ideas sometimes intersected with philosophical discussions about the nature of matter and transformation.

**Allegory**. A literary or symbolic representation in which characters, events, or settings represent abstract ideas or moral qualities. Allegorical interpretation was a common method for understanding sacred texts in medieval Jewish thought, allowing for deeper philosophical and spiritual meanings to be found.

**Allusion**. An indirect reference to a person, place, event, or literary work. Allusions were frequently used in medieval Jewish literature to convey complex ideas and to connect contemporary thought with earlier traditions.

**Amalga** (from Greek "amalga"). This term is not standard in philosophical glossaries. If it appears in a medieval Jewish philosophical text, its meaning would depend heavily on the specific context and the author's intent. It could possibly refer to a mixture, a composite, or a particular kind of substance, possibly related to alchemical or medical concepts.

**Amalric of Bena**. A theologian whose teachings in the early 13th century were condemned as pantheistic. His ideas, which suggested the immanence of God in all things, created controversy and were debated by Jewish thinkers, particularly in relation to discussions about God's transcendence and unity.

**Amoraim** (singular: Amora). The rabbis who compiled and edited the Gemara, the commentary on the Mishnah, during the period of the Talmud (c. 200-500 CE). Their discussions and interpretations laid the groundwork for much of later Jewish legal and theological thought.

**Anagogical Interpretation**. An interpretation that seeks to find spiritual or mystical meanings in a text. This type of interpretation often goes beyond the literal or allegorical meaning to uncover deeper, divine truths.

**Analogy**. A comparison between two things, typically for the purpose of explanation or clarification. Analogies were widely used in medieval Jewish philosophy to explain complex theological concepts by relating them to more familiar phenomena.

**Analysis**. The process of breaking down a complex subject or substance into its component parts in order to understand it. Philosophical analysis was a key method for medieval thinkers seeking to clarify concepts and arguments.

**Animism**. The belief that natural objects, phenomena, and the universe itself possess souls or spirits. While not a dominant belief in mainstream medieval Jewish philosophy, elements of animistic thought might be found in folk traditions or esoteric interpretations.

**Anthropomorphism**. The attribution of human characteristics or behavior to a god, animal, or object. Many medieval Jewish philosophers, particularly those influenced by Aristotelianism, sought to purify the concept of God from anthropomorphic descriptions, emphasizing God's incorporeality and transcendence.

**Antinomianism**. The rejection of moral laws or religious commandments. This concept is contrary to the fundamental principles of Judaism, which emphasizes adherence to the Law (Halakha).

**Aphorism**. A concise statement of a principle or truth. Many medieval Jewish philosophical works are characterized by the use of aphorisms to express profound ideas succinctly.

**Apologetics**. The defense of religious doctrines or beliefs against criticism. Medieval Jewish philosophers often engaged in apologetics, defending Judaism against the claims of other religions and philosophical systems.

**Apostasy**. The abandonment or renunciation of one's religious beliefs. This was a serious issue in medieval Jewish history, and philosophical arguments were sometimes used to address its causes and consequences.

**Apparent Good**. That which appears to be good but is not truly so. This concept is relevant to discussions of ethics and moral choice, where individuals may be tempted by superficial or ultimately harmful desires.

**Aquinas, Thomas**. (1225-1274). The most influential philosopher and theologian of the Scholastic tradition. While not Jewish, his work profoundly influenced later Christian thought and engaged with many of the same Aristotelian texts and philosophical problems that were central to medieval Jewish philosophy. Jewish thinkers were aware of and sometimes responded to Christian Scholasticism.

**Arabic Philosophy**. The philosophical traditions that flourished in the Islamic world from the 9th to the 12th centuries. This tradition, which was heavily influenced by Greek philosophy (especially Aristotle), had a tremendous impact on medieval Jewish philosophy. Many Jewish philosophers wrote in Arabic and engaged directly with Arabic philosophical texts.

**Aramaic**. An ancient Semitic language related to Hebrew. Aramaic was widely spoken in ancient Israel and the surrounding regions. It is the language of significant portions of the Talmud and other important Jewish religious texts.

**Arete**. A Greek term generally translated as "virtue," "excellence," or "moral goodness." In the context of medieval philosophy, discussions of "arete" (often translated as "midah" or "middot" in Hebrew) were central to ethics and the pursuit of a good life.

**Argument**. A series of statements intended to establish the truth of a conclusion. Philosophical argument is a fundamental tool for constructing and evaluating philosophical claims.

**Aristotle**. (384-322 BCE). The ancient Greek philosopher whose works were foundational for much of medieval Western and Islamic philosophy, including Jewish philosophy. His system of logic, metaphysics, ethics, and natural philosophy was extensively studied, translated, and commented upon by medieval Jewish thinkers.

**Arousal**. In a philosophical or spiritual context, arousal might refer to the awakening of the intellect, the stirring of desire, or the beginning of a process of change or development.

**Artificial Intelligence**. A modern term referring to the simulation of human intelligence in machines. This concept is not directly present in medieval Jewish philosophy, but discussions of the nature of the intellect and the possibility of non-human intelligence might be seen as precursors.

**Asceticism**. A lifestyle characterized by abstinence from worldly pleasures and self-denial, often for religious or spiritual reasons. While not universally practiced, ascetic tendencies and discussions about self-discipline appear in some medieval Jewish thought.

**Ascriptivism**. The attribution of qualities or characteristics to a person or thing. In philosophical discussions, this can relate to how attributes are assigned to entities, particularly to God.

**Assembly of Israel (Knesset Yisrael)**. In Jewish thought, this refers to the collective community of Israel, often seen as having a spiritual and communal identity. Philosophical discussions might explore its relationship to God and its role in salvation history.

**Assimilation**. The process by which a minority group or culture comes to resemble a dominant group or assume characteristics of the dominant culture. This was a perennial concern for Jewish communities throughout history, and philosophical ideas could inform discussions about maintaining Jewish identity.

**Associationism**. In psychology and philosophy, the theory that the mind is composed of a number of basic elements, such as simple sensations and ideas, which are combined through the process of association. This concept relates to how knowledge and thoughts are formed.

**Astrology**. The study of the movements and relative positions of celestial bodies interpreted as having an influence on human affairs and the natural world. While sometimes viewed with skepticism, astrological ideas were present in the broader cultural milieu and occasionally discussed by Jewish thinkers, often critically.

**Astronomy**. The scientific study of celestial objects, space, and the physical universe as a whole. Astronomy was a significant field of study for many medieval Jewish scholars, including Abraham ibn Ezra and Maimonides, who saw it as a means to understand God's creation and the order of the cosmos.

**Atheism**. The disbelief or lack of belief in the existence of God or gods. Atheism is fundamentally opposed to the core tenets of Judaism and was generally rejected by medieval Jewish philosophers.

**Atomism**. The philosophical theory that all matter consists of indivoluble particles called atoms. While ancient atomism existed, it was not widely adopted by medieval Jewish philosophers, who generally followed Aristotelian views of matter.

**Attribute**. A quality or characteristic ascribed to a person or thing. In theology and metaphysics, the attributes of God are a major subject of discussion, focusing on divine perfection, knowledge, power, etc.

**Augustine of Hippo, Saint Augustine**. (354-430 CE). A hugely influential Christian theologian and philosopher. His works, particularly on faith, reason, and divine grace, were known and sometimes engaged with by medieval Jewish thinkers, although from a different theological perspective.

**Averroes (Ibn Rushd)**. (1126-1198). A prominent Arab philosopher and physician, whose commentaries on Aristotle were highly influential throughout Europe and the Islamic world. His work had a profound impact on Jewish philosophers, particularly Maimonides, who engaged extensively with his interpretations of Aristotle.

**Avicenna (Ibn Sina)**. (c. 980-1037). A Persian polymath, physician, and philosopher, whose works were also highly influential in the medieval world. His Neoplatonic-Aristotelian synthesis provided a framework for many philosophical discussions, including those within Jewish thought.

**Avodah Zarah**. (Hebrew: "Idolatry" or "Foreign Worship"). A tractate in the Mishnah and Talmud dealing with laws pertaining to idol worship and its implications. This topic often involved philosophical discussions about the nature of true worship and the dangers of false beliefs.

**Ax** (as in a tool). This word does not typically appear as a philosophical term in medieval Jewish texts. Its inclusion might suggest a very specific, possibly metaphorical or allegorical, usage within a particular text that is not commonly known or is highly specialized. Without further context, it is impossible to provide a standard philosophical definition.

**Ayin**. (Hebrew: "Nothingness," "Non-being"). A concept that appears in various mystical and philosophical traditions. In some contexts, it can refer to the absolute absence of existence, while in others it might relate to the divine, ineffable nature of God beyond human comprehension.