Endoxa derives from the word doxa

Doxa

Doxa is a Greek word meaning common belief or popular opinion, from which are derived the modern terms of orthodoxy and heterodoxy.Used by the Greek rhetoricians as a tool for the formation of argument by using common opinions, the doxa was often manipulated by sophists to persuade the people,...

 (δόξα). Whereas Plato

Plato

Plato , was a Classical Greek philosopher, mathematician, student of Socrates, writer of philosophical dialogues, and founder of the Academy in Athens, the first institution of higher learning in the Western world. Along with his mentor, Socrates, and his student, Aristotle, Plato helped to lay the...

 condemned doxa (beliefs and opinions) as a starting point for achieving Truth, Aristotle

Aristotle

Aristotle was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology...

 uses the term endoxa (commonly held beliefs accepted by the wise/by elder rhetors and/or by the public in general) to acknowledge the beliefs of the city. Endoxa is a more stable belief than doxa, because it has been "tested" in argumentative struggles in the Polis by prior interlocutors. The use of endoxa in the Stagirite's Organon can be found in Aristotle's Topics

Topics (Aristotle)

The Topics is the name given to one of Aristotle's six works on logic collectively known as the Organon. The other five are:*Categories*De Interpretatione*Prior Analytics*Posterior Analytics*On Sophistical Refutations...

and Rhetoric

Rhetoric

Rhetoric is the art of discourse, an art that aims to improve the facility of speakers or writers who attempt to inform, persuade, or motivate particular audiences in specific situations. As a subject of formal study and a productive civic practice, rhetoric has played a central role in the Western...

. Gottfried Hoffe (translated by Christine Salazar) offers a detailed discussion of the topic in "Aristotle" (2003; pp. 35-42).