The Collaborative International Dictionary
Averroism \A*ver"ro*ism\, n. The tenets of the Averroists.
Wiktionary
n. (context philosophy English) The tenets of the Averroists, having to do with the doctrine of monopsychism.
Wikipedia
Averroism is a school of Islamic philosophy that arose from the influence of the twelfth century Al-Andalus Muslim philosopher Averroës, who worked on reconciling Aristotelianism with Islam. Alternatively, the term Averroism may refer to the application of these ideas by thirteenth-century scholastic philosophers in the Latin Christian and Jewish intellectual traditions, such as Siger of Brabant, Boetius of Dacia and Maimonides. The term was used by the theologian Thomas Aquinas in a restricted sense to mean monopsychism and radical Aristotelianism.
Latin translations of Averroes' work became widely available at the universities which were springing up in Western Europe in the thirteenth century. His work and commentaries on Aristotle were responsible for the development of scholasticism, a school of thought of Christianity which examined Christian doctrines through reasoning and intellectual analysis. Scholasticism marked the golden age of philosophy in medieval Europe.