| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| observatory | (noun) a building designed and equipped to observe astronomical phenomena | - |
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| (noun) a structure commanding a wide view of its surroundings | Synonyms: lookout, lookout station, observation tower |
| outrival | (verb) be more of a rival than | Synonyms: outvie |
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| oval | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, ovate, oviform, ovoid, prolate |
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| (noun) a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it | Synonyms: ellipse |
| ovalbumin | (noun) the white part of an egg; the nutritive and protective gelatinous substance surrounding the yolk consisting mainly of albumin dissolved in water | Synonyms: albumen, egg white, white |
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| ovarian | (adjective) of or involving the ovaries | - |
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| ovariectomy | (noun) surgical removal of one or both ovaries | Synonyms: oophorectomy |
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| ovaritis | (noun) inflammation of the ovaries | - |
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| ovary | (noun) (vertebrates) one of usually two organs that produce ova and secrete estrogen and progesterone | - |
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| (noun) the organ that bears the ovules of a flower | - |
| ovate | (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, oviform, ovoid, prolate |
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| (adjective) of a leaf shape; egg-shaped with the broader end at the base | - |
| ovation | (noun) enthusiastic recognition (especially one accompanied by loud applause) | Synonyms: standing ovation |
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| overcultivate | (verb) to exhaust by excessive cultivation | Synonyms: overcrop |
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| overvaliant | (adjective) having or showing undue valor or boldness | - |
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| overvaluation | (noun) too high a value or price assigned to something | - |
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| (noun) an appraisal that is too high | Synonyms: overappraisal, overestimate, overestimation |
| overvalue | (verb) assign too high a value to | Synonyms: overestimate |
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| papovavirus | (noun) any of a group of animal viruses associated with or causing papillomas or polyomas | - |
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| pavage | (noun) the act of applying paving materials to an area | Synonyms: paving |
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| (noun) a tax toward paving streets | - |
| pavan | (noun) a stately court dance of the 16th and 17th centuries | Synonyms: pavane |
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| (noun) music composed for dancing the pavane | Synonyms: pavane |
| pavane | (noun) a stately court dance of the 16th and 17th centuries | Synonyms: pavan |
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| (noun) music composed for dancing the pavane | Synonyms: pavan |
| pavlova | (noun) a dessert consisting of a meringue base or cup filled with fruit and whipped cream | - |
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| pentavalent | (adjective) having a valence of five | - |
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| perceivable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, understandable |
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| (adjective) capable of being perceived especially by sight or hearing | - |
| pervade | (verb) spread or diffuse through | Synonyms: diffuse, imbue, interpenetrate, penetrate, permeate, riddle |
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| pervaporate | (verb) cause (a liquid) to evaporate through a semipermeable membrane | - |
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| (verb) evaporate through a semipermeable membrane | - |
| pervaporation | (noun) the concentration of a colloidal solution whose colloid will not pass through a semipermeable membrane; solution is placed in a bag of the membrane and the solvent is evaporated off | - |
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| pervasion | (noun) the process of permeating or infusing something with a substance | Synonyms: permeation, suffusion |
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| pervasive | (adjective) spreading or spread throughout | Synonyms: permeant, permeating, permeative |
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| pervasively | (adverb) in a pervasive manner | - |
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| pervasiveness | (noun) the quality of filling or spreading throughout | - |
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| polyvalence | (noun) (chemistry) the state of having a valence greater than two | Synonyms: multivalence, multivalency, polyvalency |
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| (noun) (toxicology) the state of being capable of counteracting more than one toxin or antigen or kind of microorganism | Synonyms: polyvalency |
| polyvalency | (noun) (chemistry) the state of having a valence greater than two | Synonyms: multivalence, multivalency, polyvalence |
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| (noun) (toxicology) the state of being capable of counteracting more than one toxin or antigen or kind of microorganism | Synonyms: polyvalence |
| polyvalent | (adjective) having more than one valence, or having a valence of 3 or higher | Synonyms: multivalent |
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| (adjective) containing several antibodies each capable of counteracting a specific antigen | - |
| postcava | (noun) receives blood from lower limbs and abdominal organs and empties into the posterior part of the right atrium of the heart; formed from the union of the two iliac veins | Synonyms: inferior vena cava |
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| pravastatin | (noun) an oral drug (trade name Pravachol) administered to reduce blood cholesterol levels; recommended after nonfatal heart attacks | Synonyms: Pravachol |
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| precava | (noun) receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins | Synonyms: superior vena cava |
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| preservable | (adjective) capable of being preserved | - |
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| preservation | (noun) the activity of protecting something from loss or danger | Synonyms: saving |
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| (noun) an occurrence of improvement by virtue of preventing loss or injury or other change | Synonyms: conservation |
| (noun) a process that saves organic substances from decay | - |
| (noun) the condition of being (well or ill) preserved | - |
| preservationist | (noun) someone who advocates the preservation of historical sites or endangered species or natural areas | - |
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| preservative | (adjective) tending or having the power to preserve | - |
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| (noun) a chemical compound that is added to protect against decay or decomposition | - |
| prevail | (verb) use persuasion successfully | - |
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| (verb) prove superior | Synonyms: triumph |
| (verb) continue to exist | Synonyms: die hard, endure, persist, run |
| (verb) be valid, applicable, or true | Synonyms: hold, obtain |
| (verb) be larger in number, quantity, power, status or importance | Synonyms: dominate, predominate, reign, rule |
| prevailing | (adjective) most frequent or common | Synonyms: dominant, predominant, prevalent, rife |
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| prevalence | (noun) the quality of prevailing generally; being widespread | - |
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| (noun) a superiority in numbers or amount | Synonyms: preponderance |
| (noun) (epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population | - |
| prevalent | (adjective) most frequent or common | Synonyms: dominant, predominant, prevailing, rife |
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| prevaricate | (verb) be deliberately ambiguous or unclear in order to mislead or withhold information | Synonyms: beat around the bush, equivocate, palter, tergiversate |
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| prevarication | (noun) the deliberate act of deviating from the truth | Synonyms: fabrication, lying |
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| (noun) intentionally vague or ambiguous | Synonyms: equivocation, evasiveness |
| (noun) a statement that deviates from or perverts the truth | Synonyms: lie |
| prevaricator | (noun) a person who has lied or who lies repeatedly | Synonyms: liar |
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| primaeval | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primal, primeval, primordial |
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| primeval | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primaeval, primal, primordial |
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| privacy | (noun) the quality of being secluded from the presence or view of others | Synonyms: privateness, seclusion |
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| (noun) the condition of being concealed or hidden | Synonyms: concealment, privateness, secrecy |
| private | (adjective) confined to particular persons or groups or providing privacy | - |
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| (adjective) not expressed | Synonyms: secret |
| (adjective) concerning one person exclusively | Synonyms: individual |
| (adjective) concerning things deeply private and personal | Synonyms: intimate |
| (noun) an enlisted man of the lowest rank in the Army or Marines | Synonyms: buck private, common soldier |
| privateer | (noun) a privately owned warship commissioned to prey on the commercial shipping or warships of an enemy nation | - |
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| (noun) an officer or crew member of a privateer | Synonyms: privateersman |
| privateersman | (noun) an officer or crew member of a privateer | Synonyms: privateer |
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| privately | (adverb) kept private or confined to those intimately concerned | Synonyms: in camera, in private |
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| (adverb) by a private person or interest | - |
| privateness | (noun) the quality of being secluded from the presence or view of others | Synonyms: privacy, seclusion |
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| (noun) the condition of being concealed or hidden | Synonyms: concealment, privacy, secrecy |
| privates | (noun) external sex organ | Synonyms: crotch, genital organ, genitalia, genitals, private parts |
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| privation | (noun) act of depriving someone of food or money or rights | Synonyms: deprivation |
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| (noun) a state of extreme poverty | Synonyms: deprivation, neediness, want |
| privatisation | (noun) changing something from state to private ownership or control | Synonyms: denationalisation, denationalization, privatization |
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| privatise | (verb) change from governmental to private control or ownership | Synonyms: privatize |
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| privatization | (noun) changing something from state to private ownership or control | Synonyms: denationalisation, denationalization, privatisation |
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| privatize | (verb) change from governmental to private control or ownership | Synonyms: privatise |
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| provability | (noun) capability of being demonstrated or logically proved | Synonyms: demonstrability |
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| provable | (adjective) capable of being demonstrated or proved | Synonyms: demonstrable |
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| provably | (adverb) in an obvious and provable manner | Synonyms: demonstrably, incontrovertibly |
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| pseudovariola | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudosmallpox, variola minor, West Indian smallpox, white pox |
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| ravage | (noun) (usually plural) a destructive action | Synonyms: depredation |
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| (verb) make a pillaging or destructive raid on (a place), as in wartimes | Synonyms: harry |
| (verb) cause extensive destruction or ruin utterly | Synonyms: desolate, devastate, lay waste to, scourge, waste |
| ravaged | (adjective) having been robbed and destroyed by force and violence | Synonyms: despoiled, pillaged, raped, sacked |
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| ravaging | (adjective) ruinously destructive and wasting | - |
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| (noun) plundering with excessive damage and destruction | Synonyms: devastation |
| reactivate | (verb) activate (an old file) anew | - |
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| receivable | (adjective) awaiting payment | - |
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| receivables | (noun) money that you currently expect to receive from notes or accounts | - |
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| recidivate | (verb) go back to bad behavior | Synonyms: fall back, lapse, regress, relapse, retrogress |
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| recurvate | (adjective) curved backward or inward | Synonyms: recurved |
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| reevaluate | (verb) revise or renew one's assessment | Synonyms: reassess |
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| reevaluation | (noun) the evaluation of something a second time (or more) | - |
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| relevance | (noun) the relation of something to the matter at hand | Synonyms: relevancy |
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| relevancy | (noun) the relation of something to the matter at hand | Synonyms: relevance |
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| relevant | (adjective) having a bearing on or connection with the subject at issue | - |
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| relevantly | (adverb) with relevance | - |
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| removability | (noun) The state of being able to be dismissed from office. | - |
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| removable | (adjective) capable of being removed or taken away or dismissed | - |
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| (adjective) able to be obliterated completely | Synonyms: obliterable |
| removal | (noun) the act of removing | Synonyms: remotion |
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| (noun) dismissal from office | - |
| renovate | (verb) give new life or energy to | Synonyms: animate, quicken, reanimate, recreate, repair, revive, revivify, vivify |
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| (verb) restore to a previous or better condition | Synonyms: restitute |
| (verb) make brighter and prettier | Synonyms: freshen up, refurbish |
| renovation | (noun) the act of improving by renewing and restoring | Synonyms: overhaul, redevelopment |
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| (noun) the state of being restored to its former good condition | Synonyms: refurbishment, restoration |
| renovator | (noun) a skilled worker who is employed to restore or refinish buildings or antique furniture | Synonyms: preserver, refinisher, restorer |
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| reproval | (noun) an act or expression of criticism and censure | Synonyms: rebuke, reprehension, reprimand, reproof |
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| reservation | (noun) the act of keeping back or setting aside for some future occasion | - |
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| (noun) the act of reserving (a place or passage) or engaging the services of (a person or group) | Synonyms: booking |
| (noun) an unstated doubt that prevents you from accepting something wholeheartedly | Synonyms: arriere pensee, mental reservation |
| (noun) something reserved in advance (as a hotel accommodation or a seat on a plane etc.) | - |
| (noun) a statement that limits or restricts some claim | Synonyms: qualification |
| (noun) the written record or promise of an arrangement by which accommodations are secured in advance | - |
| (noun) a district that is reserved for particular purpose | Synonyms: reserve |
| resolvable | (adjective) capable of being settled or resolved | - |
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| (adjective) capable of being solved | Synonyms: solvable |
| retrievable | (adjective) capable of being regained especially with effort | - |
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| retrieval | (noun) the act of regaining or saving something lost (or in danger of becoming lost) | Synonyms: recovery |
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| (noun) the cognitive operation of accessing information in memory | - |
| (noun) (computer science) the operation of accessing information from the computer's memory | - |
| revaluation | (noun) a new appraisal or evaluation | Synonyms: reappraisal, reassessment, review |
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| revalue | (verb) gain in value | Synonyms: appreciate, apprise, apprize |
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| (verb) value anew | - |
| revamp | (verb) to patch up or renovate; repair or restore | - |
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| (verb) provide (a shoe) with a new vamp | Synonyms: vamp |
| revival | (noun) bringing again into activity and prominence | Synonyms: resurgence, revitalisation, revitalization, revivification |
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| (noun) an evangelistic meeting intended to reawaken interest in religion | Synonyms: revival meeting |
| revivalism | (noun) an attempt to reawaken the evangelical faith | - |
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| revivalist | (noun) a preacher of the Christian gospel | Synonyms: evangelist, gospeler, gospeller |
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| revivalistic | (adjective) of or relating to or characterizing revivalism | - |
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| rival | (adjective) as a rival in a competition | - |
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| (noun) the contestant you hope to defeat | Synonyms: challenger, competition, competitor, contender |
| (verb) be the rival of, be in competition with | - |
| (verb) be equal to in quality or ability | Synonyms: equal, match, touch |
| rivalrous | (adjective) eager to surpass others | Synonyms: emulous |
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| rivalry | (noun) the act of competing as for profit or a prize | Synonyms: competition, contention |
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| saliva | (noun) a clear liquid secreted into the mouth by the salivary glands and mucous glands of the mouth; moistens the mouth and starts the digestion of starches | Synonyms: spit, spittle |
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