circularity
🇺🇸
/ˌsɜːrkjəˈlærəti/
🇬🇧
/ˌsɜːkjəˈlærəti/
When someone uses an idea or statement to prove something, and then uses that same thing they're trying to prove to support the original idea or statement. It's like going in a circle.
The circularity in the argument made it hard to trust the conclusion.