| Term | Definition |
|---|
| obsolete | outmoded; no longer in use |
| obstetrician | physician specializing in delivery of babies |
| obstinate | stubborn; hard to control or treat |
| obstreperous | boisterous; noisy |
| obtrude | push ( oneself or ideas) forward or intrude; butt in; stick out or extrude |
| obtuse | blunt; stupid |
| obviate | make unnecessary; get rid of |
| occident | the West |
| occlude | shut; close |
| occult | mysterious; secret; supernatural |
| oculist | physician who specializes in treatment of the eyes |
| odious | hateful; vile |
| odium | detestation; hateful; disrepute |
| odoriferous | giving off an odor |
| odorous | having an odor |
| odyssey | long, eventful journey |
| offensive | attacking; insulting; distasteful |
| offhand | casual; done without prior thought |
| officious | meddlesome; excessively pushy in offering one's services |
| ogle | look at amorously; make eyes at |
| olfactory | concerning the sense of smell |
| oligarchy | government by a privileged few |
| ominous | threatening |
| omnipotent | all-powerful; One having unlimited power or authority |
| omnipresent | universally present; ubiquitous |
| omniscient | all-knowing |
| omnivorous | eating both plant and animal food; devouring everything |
| onerous | burdensome |
| onomatopoeia | formation or use of words that imitate sounds of the actions they refer to |
| onslaught | vicious assault |
| onus | burden; responsibility |
| opalescent | iridescent; lustrous |
| opaque | dark; not transparent |
| opiate | medicine to induce sleep or deaden ; something that relieve emotions or causes inaction |
| opportune | timely; well chosen |
| opportunist | individual who sacrifices principles for expediency by taking advantages of circumstances |
| opprobrium | infamy; vilification |
| optician | maker and seller of eye glasses |
| optimist | person who looks on the bright side |
| optimum | most favorable |
| optional | not compulsory |
| optometrist | one who fits glasses to remedy visual remedy |
| opulence | extreme wealth; luxuriousness; abundance |
| opus | work |
| oracular | prophetic; uttered as if with divine authority; mysterious or ambiguous |
| orator | public speaker |
| oratorio | dramatic poem set to music |
| ordain | decree or command; grant holy orders; predestine |
| ordeal | severe trial or affliction |
| ordinance | An authoritative command or order; decree |
| ordination | ceremony conferring holy orders |
| orgy | wild, drunken revelry; unrestrained indulgence |
| orient | get one;s bearing; adjust |
| orientation | act of finding oneself in a society |
| orifice | mouth like opening; small opening |
| ornate | excessively or elaborately decorated |
| ornithologist | scientist who studies birds |
| orthodox | traditional; conservative in belief |
| orthography | correct spelling |
| oscillate | vibrate pendulumlike; waver |
| osseous | made of bone; bony |
| ossify | change or harden into bone |
| ostensible | apparent; professed; pretended |
| ostentatious | showy; pretentious; trying to attract attention |
| ostracize | exclude from public favor; ban |
| oust | expel; drive out |
| outlandish | bizarre; peculiar; unconventional |
| outmoded | no longer stylish; old fashioned |
| outskirts | fringes; out boarders |
| outspoken | Spoken without reserve; candid; blunt |
| outstrip | surpass; outdo |
| outwit | outsmart; trick |
| ovation | enthusiastic applause |
| overbearing | bossy; arrogant; decisively important |
| overt | Open and observable; not hidden, concealed, or secret: open to view |
| overweening | presumptuous; arrogant |
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