Synonym: attitude, conception, explanation, hypothesis, idea, impression, inference, judgment, opinion, speculation, supposition, thought, view. Antonym: practice. Similar words: theoretical, more or less, theology, the other day, in the open, theological, story, history. Meaning: ['θɪːrɪ /'θɪərɪ] 
n. 1. a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena 2. a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena 3. a belief that can guide behavior.
n. 1. a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena 2. a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena 3. a belief that can guide behavior. 
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31. It is not a theory that is commonly subscribed to.
32. Her theory is that disillusionment with employment leads to reappraisal of career goals.
33. This theory, though recent, is more than a passing fashion.
34. The scientist used vivid examples in illustration of his theory.
35. This theory needs to be backed up with solid empirical data/evidence.
36. In theory, the buyer could ask the seller to have a test carried out.
37. The professor told his students to relate theory with practice.
38. Your plan sounds fine in theory, but will it work?
39. The course teaches you the theory but there's no substitute for practical experience.
40. The theory is based on a series of wrong assumptions.
41. It seems good in theory, but it doesn't work in practice.
42. The facts added together to build up a theory which was indisputable.
43. Dr Subroto questioned the scientific assumption on which the global warming theory is based.
44. He has a theory that wearing hats makes men go bald.
45. According to the theory of relativity, nothing can travel faster than light.
46. The theory is rendered suspect by its reliance on now discredited sources.
47. Darwin's theory of evolution was a watershed dividing the old way of thinking from the new.
48. Einstein was awarded the Nobel Prize for his contribution to Quantum Theory.
49. This theory seems to have no basis in fact.
50. The facts certainly fit your theory.
51. In theory I'm on call day and night.
52. He enunciated his theory to his colleagues.
52. Sentencedict.com try its best to collect and build good sentences.
53. There is only fragmentary evidence to support this theory.
54. Current feminist theory consists of several different trends.
55. Needless to say, theory and practice sometimes diverged.
56. The theory has been superseded by more recent research.
57. It is a new theory universally received.
58. It sounds fine in theory, but will it work?
59. Your theory doesn't square with the known facts.
60. Locke originated this theory in the 17th century.
More similar words: theoretical, more or less, theology, the other day, in the open, theological, story, history, factory, category, territory, inventory, in memory of, from memory, laboratory, regulatory, conciliatory.