theory
word
Definition
A theory is a set of ideas that explains why or how something happens. It can also mean an idea that is not yet proven, or the general principles of a subject rather than its practical use.
Usage & Nuances
Very common in science, education, and everyday speech. In daily conversation, 'theory' often means a guess or explanation ('My theory is...'), but in academic contexts it usually means a well-developed explanatory framework. Common combinations: 'scientific theory', 'in theory', 'theory and practice'. Don't confuse it with 'hypothesis', which is usually narrower and more testable.
Example Sentences
His theory about the moon was interesting.
basic
We studied music theory in class today.
basic
That theory is not proven yet.
basic
I have a theory about why the wifi keeps dropping.
natural
In theory, the plan should work, but I'm not fully convinced.
natural
That's just a theory—do you have any real evidence?
natural