theory
/ˈθɪri/
noun
- A formal set of ideas that explains something, based on general principles and supported by evidence.
- In science class, we learned about the theory of plate tectonics.
- The theory of evolution explains how species change over time.
- Einstein's theory of relativity changed physics forever.
- An idea or opinion that someone has, especially one that is not proven.
- I have a theory about why the cookies disappeared so fast.
- He has a theory that eating chocolate makes you smarter.
- Her theory is that the dog hid the toy under the couch.
- The general principles or ideas of a subject, rather than the practical skills of doing it.
- In theory, this plan should work, but in practice it might be hard.
- The course covers both music theory and playing an instrument.
- You need to learn the theory before you can drive a car.
Synonyms