# Dictionary Definition

principia See principium

# Extensive Definition

Principia could refer to:

- Philosophiae Naturalis Principia Mathematica, Isaac Newton's three-volume work containing explanations of his laws of motion and his law of universal gravitation
- Principia philosophiae, a major work by René Descartes
- Principia Mathematica, Alfred North Whitehead and Bertrand Russell's axiomatic work on mathematics
- Principia Ethica, a seminal work in metaethics by G. E. Moore
- Principia Discordia, a major holy book in Discordianism
- The Principia, a religion-based preschool, gradeschool, boarding highschool, and college
- The Principia (book), a book by Emanuel Swedenborg