- A person who rejects accepted opinions, esp. those concerning religious belief.
- A person who has formed their opinions using reason and rational enquiry; somebody who has rejected dogma, especially with regard to religion.
- Freethought is a philosophical viewpoint that holds that opinions should be formed on the basis of science, logic, and reason, and should not be influenced by authority, tradition, or any other dogma.
- A person who forms his opinions about religion and God without regard to revelation, scripture, tradition, or experience.
The definitions above are just a small collection of many. The definition of freethinker and freethought seems to broaden every day.