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SAT word list - O
oakum Hemp-fiber obtained by untwisting and picking out loosely the yarns of old hemp rope.
obdurate adj. impossible to change; stubborn
obelisk n. tall pointed stone pillar with four sides, set up as a monument or landmark
obese adj. (of people) very fat
obesity n. being obese
obituary n. printed notice (eg in a newspaper) of a person's death, often with a short account of his life and achievements
objective adj. not influenced by personal feelings or opinions; unbiased; fair
obligate v. compel (sb) legally or morally (to do sth)
obligatory adj. required by rule, law or custom; compulsory
oblique adj. not horizontal or vertical; sloping; slanting
obliterate v. remove all signs of (sth); rub or blot out
oblivion n. state of forgetting; state of being unaware or unconscious
oblong n, adj with four straight sides and angles of 90, longer than it is wide
obnoxious adj. very unpleasant; nasty; offensive
obsequious adj. ~ (to sb) too willing to obey or serve; too respectful (esp in the hope of getting a reward or favour from sb)
observance n. ~ keeping or observing (observe
observant adj. quick at noticing things
observatory n. building from which the stars, the weather, etc can be observed by scientists
obsolescence n. being obsolescent
obsolescent adj. becoming out of date; going out of use
obsolete adj. no longer used; out of date
obstetrician n. doctor who specializes in obstetrics
obstetrics n. branch of medicine and surgery concerned with childbirth
obstinacy n. being obstinate; stubbornness
obstreperous adjnoisy and uncontrolled; unruly
obstruct v. ~ sth (with sth) be or get in the way of (sb/sth); block (a road, passage, etc) ,
obstruction n. action of obstructing; being obstructed
obtrude v. ~(on/upon sb/sth) (fml ) force (oneself, one's opinions, ideas, etc) upon sb/sth, esp when unwanted
obtrusive adj. very noticeable or obvious; inclined to obtrude
obviate v. remove (sth); get rid of
occasion n. particular time
Occident n. the Occident the countries of the West, ie Europe and America
occlude to close up or block off:OBSTRUCT
occult adj. only for those with special knowledge or powers; hidden, secret
occupant n. person who occupies a house, room or position, or who possesses and occupies land
occurrence n. event; incident; happening
octagon n. flat figure with eight sides and eight angles
octave n. note that is six whole tones above or below a given note
octavo n. (abbrs oct) (size of a) book or page produced by folding a piece of paper of standard size three times to give eight sheets
octogenarian n. person between 80 and 89 years of age 8089
ocular adj. of, for, by, the eyes
oculist n. specialist in treating diseases and defects of the eye
oddity n. quality of being odd(1); strangeness
ode n. poem expressing noble feeling, often written to a person or thing, or celebrating some special event
odious adj. disgusting; hateful
odium n. general or widespread hatred or disgust felt towards a person or his actions
odoriferous giving off an order
odorous adj. having a (pleasant or unpleasant) smell
off adj. = off-side
offhand adj. too casual; abrupt
officiate v. ~ perform the duties of an office(4) or position
officious adj. too ready or willing to give orders, offer advice or help, or use one's authority; bossy and interfering
offshoot n. stem or branch growing from a main stem
ogre n. (in legends and fairy stories) cruel and frightening giant who eats people
ointment n. smooth greasy paste rubbed on the skin to heal injuries or roughness, or as a cosmetic
olfactory adj. of or concerned with the sense of smell
ominous adj. suggesting that sth bad is about to happen; threatening
omission n. action of omitting or leaving out sb/sth
omnipotence Unlimited and universal power.
omnipotent adj. having unlimited or very great power
omniscience Unlimited or infinite knowledge.
omniscient adj. knowing everything
omnivorous adj. (of animals) eating both plants and animal flesh
onerous adj. needing effort; burdensome
onrush n. strong forward rush or flow
onset n. vigorous beginning
onslaught n. ~ fierce attack
onus n. the onus duty or responsibility (for doing sth); burden
opalescence The property of combined refraction and reflection of light, resulting in smoky tints.
opaque adj. not allowing light to pass through; not transparent
operate v. (fml ) work; be in action
operative adj. operating; effective; in use
operator n. person who operates equipment, a machine, etc
operetta n. short light musical comedy
opinion n. ~ belief or judgement (about sb/sth) not necessarily based on fact or knowledge
opponent n. ~ (at/in sth) person who is against another person in a fight, a struggle, a game or an argument
opportune adj. (of time) suitable or favourable for a purpose
opportunity n. ~ ~ (to do sth) favourabletime, occasion or set of circumstances
opposite adj. ~ having a position on the other side (of sb/sth); facing
opprobrium n. public disgrace and shame
optic adj. of or concerned with the eye or the sense of sight
optician n. person who makes and sells optical instruments, esp contact lenses and glasses
optimism n. tendency to expect the best in all things; confidence in success; belief that good will triumph over evil in the end
option n. power or freedom of choosing; choice
optometry Measurement of the powers of vision.
opulence n. opulently
opulent adj. having or showing signs of great wealth
oral adj. not written; spoken
orate To deliver an elaborate or formal public speech.
oration n. formal speech made on a public occasion, esp as part of a ceremony
orator n. person who makes formal speeches in public
oratorio n. musical composition for solo voices, chorus and orchestra,usu with a Biblical theme
oratory n. small chapel for private prayer or worship
ordeal n. difficult or painful experience
ordinal adj. showing order or position in a series . > ordinal n (also ,ordinal `number)
ordination n. ceremony of ordaining (a priest or minister)
ordnance n. military supplies and materials
origin n. starting-point; source
original adj. existing from the beginning; first or earliest
originate v. ~ in sth; ~ from/with sb have sth/sb as a cause or beginning
ornate adj. richly decorated
orthodox adj. generally accepted or approved
orthodoxy n. state of being orthodox or holding orthodox beliefs
orthogonal Having or determined by right angles.
orthopedic Relating to the correcting or preventing of deformity
oscillate v. move repeatedly and regularly from one position to another and back again
osculate To kiss.
ossify v. (fml ) (cause sth to) become hard like bone; change into bone ;
ostentation n. exaggerated display (of wealth, knowledge, skill, etc) intended to impress people or make them envious
ostracism n. action of ostracizing; state of being ostracized
ostracize exclude from public favor; ban
ought To be under moral obligation to be or do.
oust v. ~ sb (fml ) remove sb (from a position, job, etc) sometimes in order to take his place
out-and-out adj. thorough; complete
outbreak n. sudden appearance or start
outburst n. bursting out; explosion
outcast n, adj ~ (person) driven away from home, friends, society, etc; homeless and friendless (person)
outcry n. ~ (about/against sth) strong public protest
outdo v. do more or better than (sb)
outlandish adj. looking or sounding strange
outlaw n. person who has broken the law and is hiding to avoid being caught
outlive v. live longer than
out-of-the-way Remotely situated.
outpost n. observation point some distance away from the main army
outrage n. (act of) great violence or cruelty
outrageous adj. very offensive or immoral; shocking
outreach To reach or go beyond.
outride To ride faster than.
outrigger n. structure projectingover the side of a boat or ship, eg for the rowlocks in a racing boat or to give stability to a canoe
outright adv. openly and honestly, with nothing held back
outskirt A border region.
outstretch To extend.
outstrip v. run faster than (sb in a race) and leave him behind
outweigh v. be greater in weight, value or importance than
overdo v. do, perform or express (sth) too fully or for too long; exaggerate
overdose n. too great an amount taken at one time
overeat v. eat more than one needs or more than is healthy
overhang v. hang over or stand out over (sth) like a shelf
overleap To leap beyond.
overlord n. nobleman on whose land people of lower rank worked
overpass n. (Brit also flyover ) bridge that carries a road over a motorway ;
overpower v. be too strong or powerful for defeat (sb) by greater strength or numbers
overreach v. ~ oneself fail by trying to achieve more than is possible
overrun v. spread over and occupy (a place) in great numbers
oversee v. watch over and control (sb/sth); supervise
overseer n. person whose job is to take charge of work and see that it is properly done
overshadow v. cause to be shaded or to have little light
overstride To step beyond.
overthrow v. cause the downfall or defeat of (sb/sth); put an end to
overtone n. something suggested or implied in addition to what is actually stated; hint
overture n. ~ (fml ) friendly approach, proposalor offer made (to sb) with the aim of starting discussions
overweight adj. heavier than is usual or allowed

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