One word substitution is one of the most important parts of English section in CDS, Air Force Group X & Y, Territorial Army & other defence exams. In order to make it easy for all the aspirants, we have already posted Idioms & Phrases.
Important One Word Substitution Beginning with O
| Word | Meaning in Hindi | Meaning in English |
| Obstetrician | दाई | One expert in the delivery of women |
| Osteology | स्थि विज्ञान | A branch of medical science that deals with study of bones |
| Oculist | नेत्र-विशेषज्ञ | One skilled in the disease of eyes |
| Oligarchy | कुलीनतंत्र | rule or government by a small group of people |
| Obsolete | अप्रचलित | Out of use |
| Omniscient | सर्वज्ञ | One who knows everything |
| Orphanage | अनाथालय | An institution for the shelter of orphans |
| .Orphan | अनाथ | A child whose parents died |
| Orthodox | रूढ़िवादी | A person holding conversational belief especially in matter of religion |
| Omnipotent | सर्वशक्तिमान | One who has great power and most powerful |
| Opaque | अपारदर्शी | Not able to be seen through; not transparent |
| Optimist | आशावादी | An optimist is someone who always sees the bright side of any situation |
| Oath | शपथ | Solemn undertaking with God’s help to do something |
| Outriders | पूलिस का आदमी | Policemen riding on motorcycles as guards |
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If you have missed out on the earlier one-word substitution articles then you can check them:
One Word Substitution from A - Z for Defence Exams
More from us:
Important Study Notes for Defence Exams
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