IELTS Vocabulary O (Part 2)
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opposite adj. Radically different or contrary in action or movement.
opprobrium n. The state of being scornfully reproached or accused of evil.
optic n. Pertaining to the eye or vision.
optician n. One who makes or deals in optical instruments or eye-glasses.
optics n. The science that treats of light and vision, and all that is connected with sight.
optimism n. The view that everything in nature and the history of mankind is ordered for the best.
option n. The right, power, or liberty of choosing.
optometry n. Measurement of the powers of vision.
opulence n. Affluence.
opulent adj. Wealthy.
oral adj. Uttered through the mouth.
orate v. To deliver an elaborate or formal public speech.
oration n. An elaborate or formal public speech.
orator n. One who delivers an elaborate or formal speech.
oratorio n. A composition for solo voices, chorus, and orchestra, generally taken from the Scriptures.
oratory n. The art of public speaking.
ordeal n. Anything that severely tests courage, strength, patience, conscience, etc.
ordinal n. That form of the numeral that shows the order of anything in a series, as first, second, third.
ordination n. A consecration to the ministry.
ordnance n. A general name for all kinds of weapons and their appliances used in war.
orgies n. Wild or wanton revelry.
origin n. The beginning of that which becomes or is made to be.
original adj. Not copied nor produced by imitation.
originate v. To cause or constitute the beginning or first stage of the existence of.
ornate adj. Ornamented to a marked degree.
orthodox adj. Holding the commonly accepted faith.
orthodoxy n. Acceptance of the common faith.
orthogonal adj. Having or determined by right angles.
orthopedic adj. Relating to the correcting or preventing of deformity
orthopedist n. One who practices the correcting or preventing of deformity
oscillate v. To swing back and forth.
osculate v. To kiss.
ossify v. to convert into bone.
ostentation n. A display dictated by vanity and intended to invite applause or flattery.
ostracism n. Exclusion from intercourse or favor, as in society or politics.
ostracize v. To exclude from public or private favor.
ought v. To be under moral obligation to be or do.
oust v. To eject.
out-and-out adv. Genuinely.
outbreak n. A sudden and violent breaking forth, as of something that has been pent up or restrained.
outburst n. A violent issue, especially of passion in an individual.
outcast n. One rejected and despised, especially socially.
outcry n. A vehement or loud cry or clamor.
outdo v. To surpass.
outlandish adj. Of barbarous, uncouth, and unfamiliar aspect or action.
outlast v. To last longer than.
outlaw n. A habitual lawbreaker.
outlive v. To continue to exist after.
out-of-the-way adj. Remotely situated.
outpost n. A detachment of troops stationed at a distance from the main body to guard against surprise.
outrage n. A gross infringement of morality or decency.
outrageous adj. Shocking in conduct.
outreach v. To reach or go beyond.
outride v. To ride faster than.
outrigger n. A part built or arranged to project beyond a natural outline for support.
outright adv. Entirely.
outskirt n. A border region.
outstretch v. To extend.
outstrip v. To go beyond.
outweigh v. To surpass in importance or excellence.
overdo v. To overtax the strength of.
overdose n. An excessive dose, usually so large a dose of a medicine that its effect is toxic.
overeat v. To eat to excess.
overhang n. A portion of a structure which projects or hangs over.
overleap v. To leap beyond.
overlord n. One who holds supremacy over another.
overpass v. To pass across or over, as a river.
overpay v. To pay or reward in excess.
overpower v. To gain supremacy or victory over by superior power.
overproduction n. Excessive production.
overreach v. To stretch out too far.
overrun v. To infest or ravage.
oversee v. To superintend.
overseer n. A supervisor.
overshadow v. To cast into the shade or render insignificant by comparison.
overstride v. To step beyond.
overthrow v. To vanquish an established ruler or government.
overtone n. A harmonic.
overture n. An instrumental prelude to an opera, oratorio, or ballet.
overweight n. Preponderance.