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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121. This new theory will certainly interest you.
122. He has constructed a new theory.
123. Well that's my theory ruled out of court.
124. Einstein formulated the Theory of Relativity in 1905.
125. The results of the experiment supported her theory.
126. Research studies carried out in Italy confirmed the theory.
127. Do these results validate his theory?
128. Your plan sounds fine in theory.
129. This theory cannot be ruled out altogether.
130. The theory has now been disproved.
131. This new theory passes my comprehension.
132. A recent book has demolished this theory.
133. This theory is now in disrepute.
134. The theory is based on the hypothesis that all men are born equal.
135. However, the converse of this theory may also be true.
136. Students learned the practical application of the theory they had learned in the classroom.
137. They possibly falsified the results to cover up the inadequacies of their theory.
138. Within a year, other researchers had torn the theory to shreds.
139. I have this theory that most people prefer being at work to being at home.
140. We observe a striking shift away from a labor theory among all mainline economists.
141. She cited a number of recent examples to support her theory.
142. A frequent metaphor for one aspect of chaos theory is called the Butterfly Effect - butterflies flapping their wings in the Amazon affect the weather in Chicago. Sentencedict.com
143. Police are working on the theory that the murderer was known to the family.
144. A number of misconceptions have grown up around this theory.
145. He had completely ignored her remark, preferring his own theory.
146. In Freud's theory, the two areas of sexuality and violence are interconnected.
147. This scientist has put forth a new theory in his research field.
148. A school dental service exists in theory, but in practice, there are few dentists to work in them.
149. She always manages to cut through the complex theory and get at the facts.
150. This research seems to give/lend some validity to the theory that the drug might cause cancer.
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.