opportunity n。 Favorable or advantageous chance or opening。
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 position 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 bees 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 monly accepted faith。
orthodoxy n。 Acceptance of the mon 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 parison。
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。
pacify v。 To bring into a peaceful state。
packet n。 A bundle； as of letters。
pact n。 A covenant。
pagan n。 A worshiper of false gods。
pageant n。 A dramatic representation； especially a spectacular one。
palate n。 The roof of the mouth。
palatial adj。 Magnificent。
paleontology n。 The branch of biology that treats of ancient life and fossil organisms。
palette n。 A thin tablet； with a hole for the thumb； upon which artists lay their colors for painting。
palinode n。 A retraction。
pall v。 To make dull by satiety。
palliate v。 To cause to appear less guilty。
pallid adj。 Of a pale or wan appearance。
palpable n。 perceptible by feeling or touch。
palsy n。 Paralysis。
paly adj。 Lacking color or brilliancy。
pamphlet n。 A brief treatise or essay； usually on a subject of current interest。
pamphleteer v。 To pose or issue pamphlets； especially controversial ones。
panacea n。 A remedy or medicine proposed for or professing to cure all diseases。
Pan…American adj。 Including or pertaining to the whole of America； both North and South。
pandemic adj。 Affecting a whole people or all classes； as a disease。
pandemonium n。 A fiendish or riotous uproar。
panegyric n。 A formal and elaborate eulogy； written or spoken； of a person or of an act。
panel n。 A rectangular piece set in or as in a frame。
panic n。 A sudden； unreasonable； overpowering fear。
panoply n。 A full set of armor。
panorama n。 A series of large pictures representing a continuous scene。
pantheism n。 The worship of nature for itself or its beauty。
Pantheon n。 A circular temple at Rome with a fine Corinthian portico and a great domed roof。
pantomime n。 Sign…language。
pantoscope n。 A very wide…angled photographic lens。
papacy n。 The official head of the Roman Catholic Church。
papyrus n。 The writing…paper of the ancient Egyptians； and later of the Romans。
parable n。 A brief narrative founded on real scenes or events usually with a moral。
paradox n。 A statement or doctrine seemingly in contradiction to the received belief。
paragon n。 A model of excellence。
parallel v。 To cause to correspond or lie in the same direction and equidistant in all parts。
parallelism n。 Essential likeness。
paralysis n。 Loss of the power of contractility in the voluntary or involuntary muscles。
paralyze v。 To deprive of the power to act。
paramount adj。 Supreme in authority。
paramour n。 One who is unlawfully and immorally a lover or a mistress。
paraphernalia n。 Miscellaneous articles of equipment or adornment。
paraphrase v。 Translate freely。
pare v。 To cut； shave； or remove （the outside） from anything。
parentage n。 The relation of parent to child； of the producer to the produced； or of cause to effect。
Pariah n。 A member of a degraded class； a social outcast。
parish n。 The ecclesiastical district in charge of a pastor。
Parisian adj。 Of or pertaining to the city of Paris。
parity n。 Equality； as of condition or rank。
parlance n。 Mode of speech。
parley v。 To converse in。
parliament n。 A legislative body。
parlor n。 A room for reception of callers or entertainment of guests。
parody v。 To render ludicrous by imitating the language of。
paronymous adj。 Derived from the same root or primitive word。
paroxysm n。 A sudden outburst of any kind of activity。
parricide n。 The murder of a parent。
parse v。 To describe； as a sentence； by separating it into its elements and describing each word。
parsimonious adj。 Unduly sparing in the use or expenditure of money。
partible adj。 Separable。
participant n。 One having a share or part。
participate v。 To receive or have a part or share of。
partition n。 That which separates anything into distinct parts。
partisan adj。 Characterized by or exhibiting undue or unreasoning devotion to a party。
passible adj。 Capable of feeling of suffering。
passive adj。 Unresponsive。
pastoral adj。 Having the spirit or sentiment of rural life。
paternal adj。 Fatherly。
paternity n。 Fatherhood。
pathos n。 The quality in any form of representation that ro