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Definition of Theory


  1. A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.
  2. An exposition of the general or abstract principles of any science; as, the theory of music.
  3. The science, as distinguished from the art; as, the theory and practice of medicine.
  4. The philosophical explanation of phenomena, either physical or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments.

Theory Quotations

In theory there is no difference between theory and practice. In practice there is.
Yogi Berra

My theory on life is that life is beautiful. Life doesn't change. You have a day, and a night, and a month, and a year. We people change - we can be miserable or we can be happy. It's what you make of your life.
Mohammed bin Rashid Al Maktoum

If you want to know the taste of a pear, you must change the pear by eating it yourself. If you want to know the theory and methods of revolution, you must take part in revolution. All genuine knowledge originates in direct experience.
Mao Zedong

In string theory, all particles are vibrations on a tiny rubber band; physics is the harmonies on the string; chemistry is the melodies we play on vibrating strings; the universe is a symphony of strings, and the 'Mind of God' is cosmic music resonating in 11-dimensional hyperspace.
Michio Kaku

The scientific theory I like best is that the rings of Saturn are composed entirely of lost airline luggage.
Mark Russell
More "Theory" Quotations

Theory Translations

theory in Dutch is theorie
theory in German is Theorie
theory in Italian is gamma
theory in Portuguese is teoria
theory in Swedish is teori
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