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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151. This new evidence lends plausibility to the theory that she was murdered.
152. Einstein's new theory on optics changed classical scientific ideas about light.
153. Last night a top criminal psychologist cast doubt on the theory.
154. The theory made the greatest pretence of having a scientific foundation.
155. My theory applies to you and by analogy to others like you.
156. His theory is linked closely with the success of our economic reform.
157. In theory, these machines should last for ten years or more.
158. One theory is that the bomb was detonated by remote control.
159. Maths is a mix of abstruse theory and detailed calculations.
160. The scientist cited vivid instances in illustration of his theory.
161. Don't prattle about your theory. You must practise it and prove it.
162. His theory is no longer tenable in light of the recent discoveries.
163. He has this theory that suffering can ennoble a person's character.
164. The theory is that there was a rare conjunction of certain bright planets that created the image of the so-called 'Star of Bethlehem'.
165. He cited Australia's sporting success as evidence for his theory.
166. I understand some of the concepts of the theory but I'm not sure about its details.
167. They've agreed in theory, but now we need to discuss practical matters.
168. The theory of natural selection was first propounded by Charles Darwin.
169. We need to open up a discussion on the basic aspects of the theory.
170. It would be convenient if the facts square with the theory, but they do not.
171. The course commences with a one week introduction to Art Theory.
172. Scientists have advanced a new theory to explain this phenomenon.
173. I find your theory is untenable and it must be rejected.
174. The theory rocked the foundations of social and moral life.
175. His comments are just abstract theory and show little understanding of the realities of the situation.
176. The new theory is a refinement of Corbin's theory of personality development.
177. Many of these youngsters know the job in theory but they're still wet behind the ears when it comes to putting it into practice.
178. It was Ptolemy who propounded the theory that the earth was at the centre of the universe.
179. This concept is at the very core of her theory.
180. Her notes gave us just the bare skeleton of her theory.
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.