Skip to ContentGo to accessibility page

Key Terms

Ahimsa
one of the highest virtues of classical Indian religions. It is the practice of refraining from harming other living things.
Argument
a set of sentences, where some of those sentences (called premises) provide support for another sentence, called the conclusion.
Coherence
a situation in which it is possible for a set of beliefs or statements to be true at the same time.
Common sense
knowledge primarily derived from perception that seems clearly or obviously true.
Conceptual analysis
the process of taking apart and making sense of sentences or claims by examining their component parts.
Definite description
a method of conceptual analysis that substitutes a descriptive phrase that uniquely identifies the object or thing named for an object term or proper name.
Enumeration
the listing of the component parts of a concept, notion, or thing.
Experimental philosophy
philosophy that uses methods from experimental science to test claims made in philosophy.
Intuition
certain and evident cognition; the kind of knowledge that is so clear that it seems impossible for it to be false.
Logic
the formalization of reasoning.
Milesians
a school of early philosophers from Miletus; followers of Thales. They were known for examining the underlying causes of natural phenomena.
Philosophy
the “love of wisdom.” An academic discipline that attempts to grasp the broadest possible understanding of things. It is characterized by rational explanation and a willingness to question assumptions.
Predicate
the portion of a sentence that provides the description or characterization of an object or name. (A philosophical predicate is different from the predicate of grammar, and their definitions should not be confused.)
Reflective equilibrium
a process of reviewing a theoretical position by going back and forth between the theory and its practical applications. This process seeks coherence between theory and practice.
Sage
a wise person. Many ancient cultures designated important wise figures as “sages.”
Sanatana dharma
the core or absolute set of moral and religious duties ordained for all people of ancient India, regardless of class or caste, and that predate the term Hinduism.
Socratic method
a method of questioning used by Socrates (and named after him later) to help people understand what they were thinking and to arrive at some truth.
Thought experiment
an imaginative scenario that tests some philosophical theory or concept by considering how it might apply in the imagined situation.
Citation/Attribution
Reuse and redistribution of this content in digital or print format:
  • This book may not be used in the training of large language models or otherwise be ingested into large language models or generative AI offerings without OpenStax's prior written permission.
  • This book uses the Creative Commons Attribution-NonCommercial-ShareAlike License, which means that you can reuse and modify the material only for noncommercial purposes, must attribute OpenStax, and must distribute any derivative works under the same license.
  • Any commercial printing of this textbook, including using a local or custom printer, must be approved by OpenStax, and proper citation provided.
  • OpenStax-copyrighted images, activities, assessments, and similar components of this book are subject to the same licensing – CC-BY-NC-SA. They can be used for noncommercial purposes with attribution. Commercial use requires permission.
  • Permission requests: Anyone who intends to incorporate this content (including text, images, and other components) into large language models, use it in AI offerings, use it commercially (including in print), and/or has questions about another use case is welcome to complete our reuse request form.
Attribution information
  • If you are redistributing all or part of this book in a noncommercial print format, then you must include on every physical page the following attribution:

    Access for free at https://openstax.org/books/introduction-philosophy/pages/1-introduction

  • If you are redistributing all or part of this book in a noncommercial digital format, then for every page that includes OpenStax content, you must license the derivative work under the same CC-BY-NC-SA license as the original, and include on every digital page view the following attribution:

    Access for free at https://openstax.org/books/introduction-philosophy/pages/1-introduction

Citation information

The information below includes the information needed to generate citations in most major styles (APA, MLA, etc.); you must reformat and organize the information as needed to fit the requirements of the style. Use the information below to generate a citation. We recommend using a citation tool such as this one.

© Apr 23, 2026 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike License. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo, and Rice University name, and Rice University logo trademarks, or wordmarks are not subject to the Creative Commons license and may not be reproduced without the prior and express written consent of Rice University.