theory
/ˈθɪəri/noun
उच्चारण थिअरी
सिद्धांत; मत
Basic word
- 1
[C, U]
a formal set of ideas that is intended to explain why something happens or exists; the principles on which a particular subject is based; an opinion or idea that somebody believes is true but that is not proved
सिद्धांत; मत
- Darwin's theory of evolution
- in theory
- Einstein's theory of relativity changed how we see time and space.
+ 2 more examples
- In theory the plan is good, but it may not work in practice.
- Scientists put forward a new theory about the origin of the disease.
Synonyms hypothesis principle thesis idea assumption
¶Idioms 1
in theory
used to say that a particular statement is supposed to be true but may in fact be wrong
सिद्धांत रूप में, कहने को
- In theory, the train reaches Delhi at six, but it is always late.
- The plan sounds good in theory.
◇Word family
≈Synonyms and antonyms
?Which word?
Keep the idea words: theory (an explanation supported by evidence), hypothesis (an idea to be tested), principle, conjecture (a guess).
विचार के शब्द याद रखिए: theory (साक्ष्य समर्थित व्याख्या), hypothesis (परखा जाने वाला विचार, परिकल्पना), principle, conjecture (अनुमान)।
“Collocations, idioms and sayings
In theory (according to the rules or ideas, but often not true in reality: 'In theory, it is simple; in practice, it is difficult'), theory and practice.
Idioms बहुत पूछे जाते हैं: in theory (नियमों या विचारों के अनुसार, पर प्रायः वास्तविकता में सच नहीं, सैद्धांतिक रूप से: 'In theory, it is simple; in practice, it is difficult'), theory and practice।
✓In the exam
General knowledge
Science GK, asked often: Charles Darwin gave the theory of evolution by natural selection ('On the Origin of Species', 1859); Albert Einstein gave the theory of relativity (E = mc²); the Big Bang theory explains the origin of the universe; Alfred Wegener gave the continental drift theory.
विज्ञान GK में अक्सर पूछा जाता है: Charles Darwin ने प्राकृतिक चयन द्वारा विकास का सिद्धांत दिया ('On the Origin of Species', 1859); Albert Einstein ने सापेक्षता का सिद्धांत दिया (E = mc²); Big Bang सिद्धांत ब्रह्मांड की उत्पत्ति समझाता है; Alfred Wegener ने महाद्वीपीय विस्थापन सिद्धांत दिया।