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- (UK) IPA (key): /ˈθɪəri/ or /ˈθiːəri/ or /ˈθɪri/
- (US) IPA (key): /ˈθiːəri/ or /ˈθɪri/
- (countable) A theory is an idea that tries to explain an observation.
- The new information showed that his theory about growth was incorrect.
- Nobody has disproved Einstein's theory of general relativity.