Meaning of the word theory in English

What does theory mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

theory

US /ˈθɪr.i/
UK /ˈθɪr.i/
"theory" picture

Noun

1.

a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.

Example:
The scientist proposed a new theory about the origin of the universe.
His theory on human behavior is widely accepted.
2.

a set of principles on which the practice of an activity is based.

Example:
He studied music theory for many years.
The course covers both the theory and practice of teaching.
3.

an idea used to account for a situation or justify a course of action.

Example:
My theory is that he's trying to avoid us.
It's just a theory, but it makes sense.
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