| perennate | (verb) survive from season to season, of plants | - |
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| perennation | (noun) the process of living through a number of years (as a perennial plant) | - |
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| perennial | (adjective) lasting three seasons or more | - |
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| (adjective) recurring again and again | Synonyms: recurrent, repeated |
| (adjective) lasting an indefinitely long time; suggesting self-renewal | - |
| (noun) (botany) a plant lasting for three seasons or more | - |
| perennially | (adverb) in a perennial manner; repeatedly | - |
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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 | (adjective) being complete of its kind and without defect or blemish | - |
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| (adjective) precisely accurate or exact | - |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |
| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
| (verb) make perfect or complete | Synonyms: hone |
| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfected | (adjective) (of plans, ideas, etc.) perfectly formed | - |
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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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| perfectible | (adjective) capable of becoming or being made 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 |
| perfectly | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, dead, utterly |
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| (adverb) in a perfect or faultless way | - |
| perfervid | (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, impassioned, torrid |
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| perfidious | (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: punic, treacherous |
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| perfidiously | (adverb) in a perfidious manner | - |
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| 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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| perfoliate | (adjective) (of a leaf) having the base united around (and apparently pierced by) the stem | - |
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| perforate | (adjective) having a hole cut through | Synonyms: perforated, pierced, punctured |
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| (verb) make a hole into or between, as for ease of separation | Synonyms: punch |
| (verb) pass into or through, often by overcoming resistance | Synonyms: penetrate |
| perforated | (adjective) having a number or series of holes | - |
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| (adjective) having a hole cut through | Synonyms: perforate, pierced, punctured |
| 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 | - |
| perforce | (adverb) by necessity; by force of circumstance | - |
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| perform | (verb) carry out or perform an action | Synonyms: do, execute |
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| (verb) give a performance (of something) | - |
| (verb) get (something) done | Synonyms: do |
| (verb) perform a function | - |
| 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 |
| (verb) apply perfume to | Synonyms: scent |
| (verb) fill or impregnate with an odor | Synonyms: aromatise, aromatize |
| perfumed | (adjective) having a natural fragrance | Synonyms: odoriferous, odorous, scented, sweet-scented, sweet-smelling, sweet |
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| (adjective) filled or impregnated with perfume | Synonyms: scented |
| 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 | - |
| perfunctorily | (adverb) in a set manner without serious attention; as a formality | Synonyms: pro forma |
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| perfunctory | (adjective) hasty and without attention to detail; not thorough | Synonyms: casual, cursory, passing, superficial |
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| (adjective) done or produced as a formality only | Synonyms: pro forma |
| perfuse | (verb) cause to spread or flush or flood through, over, or across | Synonyms: suffuse |
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| (verb) force a fluid through (a body part or tissue) | - |
| 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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| perhaps | (adverb) by chance | Synonyms: maybe, mayhap, peradventure, perchance, possibly |
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| peri | (noun) a beautiful and graceful girl | - |
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| (noun) (Persian folklore) a supernatural being descended from fallen angels and excluded from paradise until penance is done | - |
| perianal | (adjective) around the anus | - |
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| perianth | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perigone, perigonium |
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| periapsis | (noun) (astronomy) the point in an orbit closest to the body being orbited | Synonyms: point of periapsis |
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| periarteritis | (noun) inflammation of the outer coat of an artery | - |
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| pericardiac | (adjective) located around the heart or relating to or affecting the pericardium | Synonyms: pericardial |
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| pericardial | (adjective) located around the heart or relating to or affecting the pericardium | Synonyms: pericardiac |
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| pericarditis | (noun) inflammation of the pericardium | - |
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| pericardium | (noun) a serous membrane with two layers that surrounds the heart | - |
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| pericarp | (noun) the ripened and variously modified walls of a plant ovary | Synonyms: seed vessel |
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| pericementoclasia | (noun) pus pocket formation around a tooth | - |
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| periclase | (noun) a white solid mineral that occurs naturally as periclase; a source of magnesium | Synonyms: magnesia, magnesium oxide |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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| peridium | (noun) outer layer of the spore-bearing organ in many fungi | - |
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| peridot | (noun) a pale green variety of chrysolite; used as a gemstone | - |
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| peridotite | (noun) a dark coarse-grained igneous rock consisting principally of olivine | - |
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| perigee | (noun) periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth | - |
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| perigon | (noun) an angle of 360 degrees | Synonyms: round angle |
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| perigonal | (adjective) of or relating to a perigone | - |
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| perigone | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigonium |
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| perigonium | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigone |
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| perihelion | (noun) periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun | - |
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| perijove | (noun) periapsis in orbit around Jupiter | - |
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| peril | (noun) a venture undertaken without regard to possible loss or injury | Synonyms: danger, risk |
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| (noun) a source of danger; a possibility of incurring loss or misfortune | Synonyms: endangerment, hazard, jeopardy, risk |
| (noun) a state of danger involving risk | Synonyms: riskiness |
| (verb) put in a dangerous, disadvantageous, or difficult position | Synonyms: endanger, expose, queer, scupper |
| (verb) pose a threat to; present a danger to | Synonyms: endanger, imperil, jeopardise, jeopardize, menace, threaten |
| perilous | (adjective) fraught with danger | Synonyms: parlous, precarious, touch-and-go |
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| perilously | (adverb) in a dangerous manner | Synonyms: dangerously, hazardously |
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| perilousness | (noun) the state of being dangerous | Synonyms: hazardousness |
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| perilune | (noun) periapsis in orbit around the moon | Synonyms: periselene |
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| perilymph | (noun) the bodily fluid that fills the space between the bony labyrinth and the membranous labyrinth of the inner ear | - |
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| perimeter | (noun) the size of something as given by the distance around it | Synonyms: circumference |
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| (noun) the boundary line or the area immediately inside the boundary | Synonyms: border, margin |
| (noun) a line enclosing a plane areas | - |
| perimysium | (noun) the sheath of connective tissue that covers a bundle of muscle fibers | - |
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| perinasal | (adjective) near the nose | Synonyms: perirhinal |
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| perinatal | (adjective) occurring during the period around birth (5 months before and 1 month after) | - |
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| perinatologist | (noun) an obstetrician specializing in perinatology | - |
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| perinatology | (noun) the branch of obstetrics concerned with the anatomy and physiology and diagnosis and treatment of disorders of the mother and the fetus or newborn baby during late pregnancy and childbirth and the puerperium | - |
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| perineal | (adjective) of or relating to the perineum | - |
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| perineotomy | (noun) surgical incision into the perineum | - |
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| perineum | (noun) the general region between the anus and the genital organs | - |
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| perineurium | (noun) the sheath of connective tissue that covers a bundle of nerve fibers | - |
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| period | (noun) a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | Synonyms: full point, full stop, point, stop |
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| (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, menstruum |
| (noun) an amount of time | Synonyms: period of time, time period |
| (noun) the interval taken to complete one cycle of a regularly repeating phenomenon | - |
| (noun) a unit of geological time during which a system of rocks formed | Synonyms: geological period |
| (noun) the end or completion of something | - |
| (noun) (ice hockey) one of three divisions into which play is divided in hockey games | - |
| periodic | (adjective) happening or recurring at regular intervals | Synonyms: periodical |
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| (adjective) recurring or reappearing from time to time | Synonyms: occasional |
| periodical | (adjective) happening or recurring at regular intervals | Synonyms: periodic |
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| (noun) a publication that appears at fixed intervals | - |
| periodically | (adverb) in a sporadic manner | Synonyms: sporadically |
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| periodicity | (noun) the quality of recurring at regular intervals | Synonyms: cyclicity |
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| periodontal | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontic |
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| periodontia | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontics |
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| periodontic | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontal |
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| periodontics | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontia |
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| periodontist | (noun) a dentist specializing in diseases of the gums and other structure surrounding the teeth | - |
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| periodontitis | (noun) a disease that attacks the gum and bone and around the teeth | Synonyms: periodontal disease |
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| periosteum | (noun) a dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles; contains nerves and blood vessels that nourish the enclosed bone | - |
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| peripatetic | (adjective) of or relating to Aristotle or his philosophy | Synonyms: Aristotelean, Aristotelian, Aristotelic |
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| (adjective) traveling especially on foot | Synonyms: wayfaring |
| (noun) a person who walks from place to place | - |
| peripateticism | (noun) (philosophy) the philosophy of Aristotle that deals with logic and metaphysics and ethics and poetics and politics and natural science | Synonyms: Aristotelianism |
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| peripatus | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: onychophoran, velvet worm |
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| peripeteia | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripetia, peripety |
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| peripetia | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripeteia, peripety |
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| peripety | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripeteia, peripetia |
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| peripheral | (adjective) on or near an edge or constituting an outer boundary; the outer area | - |
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| (adjective) related to the key issue but not of central importance | - |
| (noun) electronic equipment external to the circuit board that contains the CPU of a computer | Synonyms: computer peripheral, peripheral device |
| peripherally | (adverb) in or at or near a periphery or according to a peripheral role or function or relationship | - |
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