theory

Theory is part of the Academic Word List. It is important for students in college and university.

Pronunciation

• (UK) IPA ^(key): /ˈθɪəri/ or /ˈθiːəri/ or /ˈθɪri/
• (US) IPA ^(key): /ˈθiːəri/ or /ˈθɪri/

• Audio (US)

  (file)

Noun

Singular theory

Plural theories

1. 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.