Theory | Mean of theory in English Dictionary

/ˈθiːjəri/

• Noun
• an idea or set of ideas that is intended to explain facts or events
1. a widely accepted scientific theory
2. Einstein's theory of relativity
3. theories on/about evolution
4. according to atomic/economic theory
• an idea that is suggested or presented as possibly true but that is not known or proven to be true
1. Her method is based on the theory that all children want to learn.
2. There are a number of different theories about the cause of the disease.
3. She proposed a theory of her own.
4. Investigators rejected the theory that the death was accidental.
5. There is no evidence to support such a theory.
• the general principles or ideas that relate to a particular subject
1. He is a specialist in film theory and criticism.
2. music theory