theories
nounUK /ˈθɪəriz/
US /ˈθɪriz/
Ideas that people use to explain how or why something happens.
Scientists have many theories about why the dinosaurs disappeared.
OTHER MEANINGS
2. Guesses or opinions that are not proven to be true.
He has some strange theories about why the sky is blue.
3. Sets of rules and ideas used to study a subject.
She is learning the theories of music in her class.
4. Plans or ideas about how something might work.
The team shared their theories on how to win the game.