| operagoer | (noun) a patron of the opera | - |
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| operand | (noun) a quantity upon which a mathematical operation is performed | - |
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| operation | (noun) a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body | Synonyms: surgery, surgical operation, surgical procedure, surgical process |
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| (noun) (mathematics) calculation by mathematical methods | Synonyms: mathematical operation, mathematical process |
| (noun) activity by a military or naval force (as a maneuver or campaign) | Synonyms: military operation |
| (noun) a planned activity involving many people performing various actions | - |
| (noun) a process or series of acts especially of a practical or mechanical nature involved in a particular form of work | Synonyms: procedure |
| (noun) a business especially one run on a large scale | - |
| (noun) the activity of operating something (a machine or business etc.) | - |
| (noun) (psychology) the performance of some composite cognitive activity; an operation that affects mental contents | Synonyms: cognitive operation, cognitive process, mental process, process |
| (noun) (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) | - |
| (noun) process or manner of functioning or operating | Synonyms: functioning, performance |
| (noun) the state of being in effect or being operative | - |
| operationalism | (noun) (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it | - |
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| operations | (noun) financial transactions at a brokerage; having to do with the execution of trades and keeping customer records | Synonyms: trading operations |
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| operative | (noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: PI, private detective, private eye, private investigator, shamus, sherlock |
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| (noun) a person secretly employed in espionage for a government | Synonyms: intelligence agent, intelligence officer, secret agent |
| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
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| (noun) someone who owns or operates a business | - |
| (noun) a shrewd or unscrupulous person who knows how to circumvent difficulties | Synonyms: hustler, wheeler dealer |
| (noun) a speculator who trades aggressively on stock or commodity markets | - |
| (noun) (mathematics) a symbol or function representing a mathematical operation | - |
| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| operetta | (noun) a short amusing opera | Synonyms: light opera |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| operoseness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, toilsomeness |
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| outdoorsperson | (noun) a person who spends time outdoors (e.g., hunting or fishing) | - |
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| pamperer | (noun) someone who pampers or spoils by excessive indulgence | Synonyms: coddler, mollycoddler, spoiler |
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| pampering | (noun) the act of indulging or gratifying a desire | Synonyms: humoring, humouring, indulgence, indulging |
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| panspermia | (noun) The hypothesis that microorganisms may transmit life from outer space to habitable bodies; or the process of such transmission. | - |
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| paper | (noun) the physical object that is the product of a newspaper publisher | Synonyms: newspaper |
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| (noun) a medium for written communication | - |
| (noun) an essay (especially one written as an assignment) | Synonyms: composition, report, theme |
| (noun) a scholarly article describing the results of observations or stating hypotheses | - |
| (noun) a daily or weekly publication on folded sheets; contains news and articles and advertisements | Synonyms: newspaper |
| (noun) a business firm that publishes newspapers | Synonyms: newspaper, newspaper publisher |
| (noun) a material made of cellulose pulp derived mainly from wood or rags or certain grasses | - |
| paperback | (noun) a book with paper covers | Synonyms: paper-back book, paperback book, soft-cover, soft-cover book, softback, softback book |
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| paperboard | (noun) a cardboard suitable for making posters | Synonyms: poster board, posterboard |
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| paperboy | (noun) a boy who sells or delivers newspapers | - |
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| paperclip | (noun) a wire or plastic clip for holding sheets of paper together | Synonyms: gem clip, paper clip |
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| paperer | (noun) one whose occupation is decorating walls with wallpaper | Synonyms: paperhanger |
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| paperhanger | (noun) one whose occupation is decorating walls with wallpaper | Synonyms: paperer |
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| (noun) someone who passes bad checks or counterfeit paper money | - |
| paperhanging | (noun) the application of wallpaper | Synonyms: papering |
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| papering | (noun) the application of wallpaper | Synonyms: paperhanging |
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| paperknife | (noun) dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books | Synonyms: letter opener, paper knife |
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| papermaking | (noun) the craft of making paper | - |
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| papers | (noun) writing that provides information (especially information of an official nature) | Synonyms: document, written document |
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| paperweight | (noun) a weight used to hold down a stack of papers | - |
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| paperwork | (noun) work that involves handling papers: forms or letters or reports etc. | - |
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| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
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| pauper | (noun) a person who is very poor | - |
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| pauperisation | (noun) the act of making someone poor | Synonyms: impoverishment, pauperization |
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| pauperism | (noun) a state of extreme poverty or destitution | Synonyms: indigence, need, pauperization, penury |
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| pauperization | (noun) the act of making someone poor | Synonyms: impoverishment, pauperisation |
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| (noun) a state of extreme poverty or destitution | Synonyms: indigence, need, pauperism, penury |
| peacekeeper | (noun) the pistol of a law officer in the old West | - |
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| (noun) someone who keeps peace | - |
| (noun) a member of a military force that is assigned (often with international sanction) to preserve peace in a trouble area | - |
| peeper | (noun) an animal that makes short high-pitched sounds | - |
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| (noun) an informal term referring to the eye | - |
| (noun) a viewer who enjoys seeing the sex acts or sex organs of others | Synonyms: Peeping Tom, voyeur |
| peperomia | (noun) any of various plants of the genus Peperomia; grown primarily for their often succulent foliage | - |
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| pepper | (noun) pungent seasoning from the berry of the common pepper plant of East India; use whole or ground | Synonyms: peppercorn |
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| (noun) sweet and hot varieties of fruits of plants of the genus Capsicum | - |
| (noun) any of various tropical plants of the genus Capsicum bearing peppers | Synonyms: capsicum, capsicum pepper plant |
| (noun) climber having dark red berries (peppercorns) when fully ripe; southern India and Sri Lanka; naturalized in northern Burma and Assam | Synonyms: black pepper, common pepper, Madagascar pepper, Piper nigrum, white pepper |
| peppercorn | (noun) pungent seasoning from the berry of the common pepper plant of East India; use whole or ground | Synonyms: pepper |
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| pepperidge | (noun) columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall | Synonyms: black gum, Nyssa sylvatica, sour gum |
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| pepperiness | (noun) a hot spiciness | Synonyms: hotness |
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| peppermint | (noun) a candy flavored with peppermint oil | Synonyms: peppermint candy |
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| (noun) herb with downy leaves and small purple or white flowers that yields a pungent oil used as a flavoring | Synonyms: Mentha piperita |
| (noun) red gum tree of Tasmania | Synonyms: Eucalyptus amygdalina, peppermint gum, red gum |
| pepperoni | (noun) a pork and beef sausage (or a thin slice of this sausage) | - |
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| pepperwood | (noun) Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood | Synonyms: California bay tree, California laurel, California olive, mountain laurel, Oregon myrtle, sassafras laurel, spice tree, Umbellularia californica |
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| pepperwort | (noun) annual herb used as salad green and garnish | Synonyms: common garden cress, garden pepper cress, Lepidium sativum, pepper grass |
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| (noun) any of several water ferns of the genus Marsilea having four leaflets | Synonyms: clover fern |
| peradventure | (noun) doubt or uncertainty as to whether something is the case | - |
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| perambulation | (noun) a leisurely walk (usually in some public place) | Synonyms: amble, promenade, saunter, stroll |
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| (noun) a walk around a territory (a parish or manor or forest etc.) in order to officially assert and record its boundaries | - |
| perambulator | (noun) a small vehicle with four wheels in which a baby or child is pushed around | Synonyms: baby buggy, baby carriage, carriage, go-cart, pram, pushchair, pusher, stroller |
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| percale | (noun) a fine closely woven cotton fabric | - |
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| perceiver | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, percipient |
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| percent | (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percentage |
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| percentage | (noun) assets belonging to or due to or contributed by an individual person or group | Synonyms: part, portion, share |
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| (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percent |
| percentile | (noun) (statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total | Synonyms: centile |
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| percept | (noun) the representation of what is perceived; basic component in the formation of a concept | Synonyms: perception, perceptual experience |
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| perceptibility | (noun) the property of being perceptible by the mind or the senses | - |
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| perception | (noun) becoming aware of something via the senses | Synonyms: sensing |
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| (noun) the process of perceiving | - |
| (noun) the representation of what is perceived; basic component in the formation of a concept | Synonyms: percept, perceptual experience |
| (noun) a way of conceiving something | - |
| (noun) knowledge gained by perceiving | - |
| perceptiveness | (noun) the quality of insight and sympathetic understanding | - |
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| (noun) delicate discrimination (especially of esthetic values) | Synonyms: appreciation, discernment, taste |
| (noun) perception of that which is obscure | Synonyms: discernment |
| (noun) a feeling of understanding | Synonyms: insight, perceptivity |
| perceptivity | (noun) a feeling of understanding | Synonyms: insight, perceptiveness |
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| perceptuality | (noun) The quality of being related to the organization, identification, and interpretation of sensory information. | - |
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| perch | (noun) spiny-finned freshwater food and game fishes | - |
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| (noun) any of numerous spiny-finned fishes of various families of the order Perciformes | - |
| (noun) support consisting of a branch or rod that serves as a resting place (especially for a bird) | - |
| (noun) any of numerous fishes of America and Europe | - |
| (noun) an elevated place serving as a seat | - |
| (noun) a linear measure of 16.5 feet | Synonyms: pole, rod |
| (noun) a square rod of land | Synonyms: pole, rod |
| percher | (noun) a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists | Synonyms: Insessores, order Insessores, perching bird |
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| (noun) a person situated on a perch | - |
| perchlorate | (noun) a salt of perchloric acid | - |
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| perchloride | (noun) a chloride containing an unusually high proportion of chlorine | - |
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| perchloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, tetrachloromethane |
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| percipient | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, perceiver |
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| percoid | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid fish, percoidean |
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| percoidean | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid, percoid fish |
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| percolate | (noun) the product of percolation | - |
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| percolation | (noun) the act of making coffee in a percolator | - |
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| (noun) the filtration of a liquid for extraction or purification | - |
| (noun) the slow passage of a liquid through a filtering medium | Synonyms: infiltration |
| percolator | (noun) a coffeepot in which boiling water ascends through a central tube and filters back down through a basket of ground coffee beans | - |
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| percussion | (noun) the act of exploding a percussion cap | - |
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| (noun) the act of playing a percussion instrument | - |
| (noun) tapping a part of the body for diagnostic purposes | Synonyms: pleximetry |
| (noun) the section of a band or orchestra that plays percussion instruments | Synonyms: percussion section, rhythm section |
| percussionist | (noun) a musician who plays percussion instruments | - |
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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| perdition | (noun) (Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment | Synonyms: Hell, infernal region, Inferno, nether region, pit |
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| perdurability | (noun) the property of being extremely durable | - |
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| peregrination | (noun) traveling or wandering around | - |
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| peregrine | (noun) a widely distributed falcon formerly used in falconry | Synonyms: Falco peregrinus, peregrine falcon |
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| perennation | (noun) the process of living through a number of years (as a perennial plant) | - |
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| perennial | (noun) (botany) a plant lasting for three seasons or more | - |
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| perestroika | (noun) an economic policy adopted in the former Soviet Union; intended to increase automation and labor efficiency but it led eventually to the end of central planning in the Russian economy | - |
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| perfect | (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
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| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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| perfume | (noun) a toiletry that emits and diffuses a fragrant odor | Synonyms: essence |
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| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, scent |
| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| perfumery | (noun) the art of making perfumes | - |
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| (noun) an establishment where perfumes are made | - |
| (noun) store where perfumes are sold | - |
| (noun) perfumes in general | - |
| perfusion | (noun) pumping a liquid into an organ or tissue (especially by way of blood vessels) | - |
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| pergola | (noun) a framework that supports climbing plants | Synonyms: arbor, arbour, bower |
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