| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| alpaca | (noun) domesticated llama with long silky fleece; believed to be a domesticated variety of the guanaco | Synonyms: Lama pacos |
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| (noun) a thin glossy fabric made of the wool of the Lama pacos, or made of a rayon or cotton imitation of that wool | - |
| (noun) wool of the alpaca | - |
| apache | (noun) a Parisian gangster | - |
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| backpack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, haversack, knapsack, packsack, rucksack |
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| backpacker | (noun) a hiker who wears a backpack | Synonyms: packer |
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| backpacking | (noun) carrying something in a pack on the back | Synonyms: packing |
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| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| calpac | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpack, kalpac |
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| calpack | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpac, kalpac |
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| capaciousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: commodiousness, roominess, spaciousness |
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| (noun) intellectual breadth | Synonyms: roominess |
| capacitance | (noun) an electrical device characterized by its capacity to store an electric charge | Synonyms: capacitor, condenser, electrical condenser |
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| (noun) an electrical phenomenon whereby an electric charge is stored | Synonyms: capacity, electrical capacity |
| capacitor | (noun) an electrical device characterized by its capacity to store an electric charge | Synonyms: capacitance, condenser, electrical condenser |
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| capacity | (noun) the maximum production possible | - |
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| (noun) a specified function | - |
| (noun) capability to perform or produce | - |
| (noun) tolerance for alcohol | - |
| (noun) the power to learn or retain knowledge; in law, the ability to understand the facts and significance of your behavior | Synonyms: mental ability |
| (noun) an electrical phenomenon whereby an electric charge is stored | Synonyms: capacitance, electrical capacity |
| (noun) the amount that can be contained | Synonyms: content |
| (noun) (computer science) the amount of information (in bytes) that can be stored on a disk drive | - |
| (noun) the susceptibility of something to a particular treatment | Synonyms: capability |
| carapace | (noun) hard outer covering or case of certain organisms such as arthropods and turtles | Synonyms: cuticle, shell, shield |
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| compact | (noun) a small cosmetics case with a mirror; to be carried in a woman's purse | Synonyms: powder compact |
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| (noun) a small and economical car | Synonyms: compact car |
| (noun) a signed written agreement between two or more parties (nations) to perform some action | Synonyms: concordat, covenant |
| compaction | (noun) the act of crushing | Synonyms: crunch, crush |
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| (noun) an increase in the density of something | Synonyms: compression, concretion, densification |
| compactness | (noun) the spatial property of being crowded together | Synonyms: concentration, denseness, density, tightness |
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| (noun) the consistency of a compact solid | - |
| crawlspace | (noun) low space beneath a floor of a building; gives workers access to wiring or plumbing | Synonyms: crawl space |
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| cyberspace | (noun) a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange | Synonyms: internet, net |
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| epacris | (noun) any heathlike evergreen shrub of the genus Epacris grown for their showy and crowded spikes of small bell-shaped or tubular flowers | - |
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| episcopacy | (noun) the collective body of bishops | Synonyms: episcopate |
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| gazpacho | (noun) a soup made with chopped tomatoes and onions and cucumbers and peppers and herbs; served cold | - |
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| headspace | (noun) the volume left at the top of a filled container (bottle or jar or tin) before sealing | - |
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| impact | (noun) influencing strongly | Synonyms: encroachment, impingement |
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| (noun) the violent interaction of individuals or groups entering into combat | Synonyms: shock |
| (noun) the striking of one body against another | - |
| (noun) a forceful consequence; a strong effect | Synonyms: wallop |
| impaction | (noun) a sharp collision produced by striking or dashing against something | Synonyms: impingement |
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| (noun) a disorder in which a tooth is so crowded in its socket that it cannot erupt normally | Synonyms: impacted tooth |
| (noun) a disorder in which feces are impacted in the lower colon | - |
| (noun) the condition of being pressed closely together and firmly fixed | - |
| incapacity | (noun) lack of physical or natural qualifications | - |
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| (noun) lack of intellectual power | - |
| kalpac | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpac, calpack |
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| meatpacking | (noun) wholesale packaging of meat for future sale (including slaughtering and processing and distribution to retailers) | Synonyms: meat-packing business, meat packing |
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| mepacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, quinacrine, quinacrine hydrochloride |
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| mishpachah | (noun) (Yiddish) the entire family network of relatives by blood or marriage (and sometimes close friends) | Synonyms: mishpocha |
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| opacification | (noun) the process of becoming cloudy or opaque | - |
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| opacity | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opaqueness |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opaqueness |
| (noun) the phenomenon of not permitting the passage of electromagnetic radiation | - |
| paca | (noun) large burrowing rodent of South America and Central America; highly esteemed as food | Synonyms: Cuniculus paca |
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| pace | (noun) a step in walking or running | Synonyms: stride, tread |
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| (noun) the relative speed of progress or change | Synonyms: rate |
| (noun) a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride | Synonyms: yard |
| (noun) the distance covered by a step | Synonyms: footstep, step, stride |
| (noun) the rate of moving (especially walking or running) | Synonyms: gait |
| (noun) the rate of some repeating event | Synonyms: tempo |
| pacemaker | (noun) a horse used to set the pace in racing | Synonyms: pacer, pacesetter |
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| (noun) an implanted electronic device that takes over the function of the natural cardiac pacemaker | Synonyms: artificial pacemaker |
| (noun) a specialized bit of heart tissue that controls the heartbeat | Synonyms: cardiac pacemaker, SA node, sinoatrial node |
| (noun) a leading instance in its field | Synonyms: pacesetter |
| pacer | (noun) a horse trained to a special gait in which both feet on one side leave the ground together | - |
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| (noun) a horse used to set the pace in racing | Synonyms: pacemaker, pacesetter |
| pacesetter | (noun) a horse used to set the pace in racing | Synonyms: pacemaker, pacer |
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| (noun) a leading instance in its field | Synonyms: pacemaker |
| pacha | (noun) a civil or military authority in Turkey or Egypt | Synonyms: pasha |
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| pachinko | (noun) a Japanese pinball game played on a vertical board | - |
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| pachisi | (noun) an ancient board game resembling backgammon; played on a cross-shaped board | Synonyms: parchesi, parchisi |
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| pachouli | (noun) a heavy perfume made from the patchouli plant | Synonyms: patchouli, patchouly |
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| (noun) small East Indian shrubby mint; fragrant oil from its leaves is used in perfumes | Synonyms: patchouli, patchouly, Pogostemon cablin |
| pachuco | (noun) a Mexican-American teenager who belongs to a neighborhood gang and who dresses in showy clothes | - |
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| pachycephalosaur | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaurus |
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| pachycephalosaurus | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaur |
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| pachycheilia | (noun) an abnormal thickness of the lips | - |
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| pachyderm | (noun) any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus | - |
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| pachyderma | (noun) thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction | Synonyms: nevoid elephantiasis |
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| pachysandra | (noun) any plant of the genus Pachysandra; low-growing evergreen herbs or subshrubs having dentate leaves and used as ground cover | - |
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| pachytene | (noun) the third stage of the prophase of meiosis | - |
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| pacification | (noun) the act of appeasing someone or causing someone to be more favorably inclined | Synonyms: mollification |
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| (noun) actions taken by a government to defeat insurgency | Synonyms: counterinsurgency |
| (noun) a treaty to cease hostilities | Synonyms: peace, peace treaty |
| pacificism | (noun) the doctrine that all violence is unjustifiable | Synonyms: pacifism, passivism |
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| (noun) the belief that all international disputes can be settled by arbitration | Synonyms: pacifism |
| pacificist | (noun) someone opposed to violence as a means of settling disputes | Synonyms: disarmer, pacifist |
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| pacifier | (noun) device used for an infant to suck or bite on | Synonyms: baby's dummy, comforter, teething ring |
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| (noun) anything that serves to pacify | - |
| (noun) someone who tries to bring peace | Synonyms: conciliator, make-peace, peacemaker, reconciler |
| pacifism | (noun) the doctrine that all violence is unjustifiable | Synonyms: pacificism, passivism |
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| (noun) the belief that all international disputes can be settled by arbitration | Synonyms: pacificism |
| pacifist | (noun) someone opposed to violence as a means of settling disputes | Synonyms: disarmer, pacificist |
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| pacing | (noun) walking with slow regular strides | - |
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| (noun) (music) the speed at which a composition is to be played | Synonyms: tempo |
| pack | (noun) a convenient package or parcel (as of cigarettes or film) | - |
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| (noun) a bundle (especially one carried on the back) | - |
| (noun) a sheet or blanket (either dry or wet) to wrap around the body for its therapeutic effect | - |
| (noun) a cream that cleanses and tones the skin | Synonyms: face pack |
| (noun) a group of hunting animals | - |
| (noun) an exclusive circle of people with a common purpose | Synonyms: camp, clique, coterie, ingroup, inner circle |
| (noun) an association of criminals | Synonyms: gang, mob, ring |
| (noun) a complete collection of similar things | - |
| (noun) a large indefinite quantity | Synonyms: battalion, large number, multitude, plurality |
| package | (noun) a wrapped container | Synonyms: parcel |
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| (noun) (computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory | Synonyms: computer software, software, software package, software program, software system |
| (noun) a collection of things wrapped or boxed together | Synonyms: bundle, packet, parcel |
| packaging | (noun) the business of packing | - |
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| (noun) material used to make packages | - |
| (noun) a message issued in behalf of some product or cause or idea or person or institution | Synonyms: promo, promotion, promotional material, publicity |
| packer | (noun) a workman employed to pack things into containers | Synonyms: bagger, boxer |
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| (noun) a wholesaler in the meat-packing business | Synonyms: meat packer |
| (noun) a hiker who wears a backpack | Synonyms: backpacker |
| packet | (noun) a small package or bundle | - |
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| (noun) a boat for carrying mail | Synonyms: mail boat, mailboat, packet boat |
| (noun) (computer science) a message or message fragment | - |
| (noun) a collection of things wrapped or boxed together | Synonyms: bundle, package, parcel |
| packhorse | (noun) a workhorse used as a pack animal | - |
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| packing | (noun) the enclosure of something in a package or box | Synonyms: boxing |
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| (noun) carrying something in a pack on the back | Synonyms: backpacking |
| (noun) any material used especially to protect something | Synonyms: packing material, wadding |
| packinghouse | (noun) a plant where livestock are slaughtered and processed and packed as meat products | Synonyms: packing plant |
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| (noun) a building where foodstuffs are processed and packed | - |
| packman | (noun) someone who travels about selling his wares (as on the streets or at carnivals) | Synonyms: hawker, peddler, pedlar, pitchman |
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| packrat | (noun) any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects | Synonyms: bushytail woodrat, Neotoma cinerea, pack rat, trade rat |
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| (noun) a collector of miscellaneous useless objects | - |
| packsack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, backpack, haversack, knapsack, rucksack |
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| packsaddle | (noun) a saddle for pack animals to which loads can be attached | - |
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| packthread | (noun) a strong three-ply twine used to sew or tie packages | - |
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| pact | (noun) a written agreement between two states or sovereigns | Synonyms: accord, treaty |
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| paczki | (noun) A traditional Polish doughnut. | - |
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| papacy | (noun) the government of the Roman Catholic Church | Synonyms: pontificate |
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| radiopacity | (noun) opacity to X-rays or other radiation | Synonyms: radio-opacity |
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| rapaciousness | (noun) extreme gluttony | Synonyms: edacity, esurience, rapacity, voraciousness, voracity |
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| (noun) an excessive desire for wealth (usually in large amounts) | Synonyms: greediness, voraciousness |
| (noun) (of an animal, usually a bird) The quality of subsisting off live prey. | Synonyms: predaceousness, predaciousness, rapacity |
| rapacity | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avarice, avaritia, covetousness, greed |
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| (noun) extreme gluttony | Synonyms: edacity, esurience, rapaciousness, voraciousness, voracity |
| (noun) (of an animal, usually a bird) The quality of subsisting off live prey. | Synonyms: predaceousness, predaciousness, rapaciousness |
| sixpack | (noun) a carton containing six bottles or cans | Synonyms: six-pack, six pack |
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| space | (noun) the unlimited expanse in which everything is located | Synonyms: infinite |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: quad |
| (noun) a blank character used to separate successive words in writing or printing | Synonyms: blank |
| (noun) a blank area | Synonyms: blank space, place |
| (noun) one of the areas between or below or above the lines of a musical staff | - |
| (noun) an area reserved for some particular purpose | - |
| (noun) any location outside the Earth's atmosphere | Synonyms: outer space |
| (noun) an empty area (usually bounded in some way between things) | - |
| (noun) the interval between two times | Synonyms: distance |
| spacecraft | (noun) a craft capable of traveling in outer space; technically, a satellite around the sun | Synonyms: ballistic capsule, space vehicle |
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| spacefaring | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spaceflight |
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| spaceflight | (noun) a voyage outside the Earth's atmosphere | Synonyms: space travel, spacefaring |
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| spaceman | (noun) a person trained to travel in a spacecraft | Synonyms: astronaut, cosmonaut |
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| spaceship | (noun) a spacecraft designed to carry a crew into interstellar space (especially in science fiction) | Synonyms: starship |
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| spacesuit | (noun) a pressure suit worn by astronauts while in outer space | - |
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| spacewalker | (noun) an astronaut who is active outside a spacecraft in outer space | - |
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| spacing | (noun) the property possessed by an array of things that have space between them | Synonyms: spatial arrangement |
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| (noun) the time between occurrences of a repeating event | - |
| spaciousness | (noun) spatial largeness and extensiveness (especially inside a building) | Synonyms: capaciousness, commodiousness, roominess |
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| spackle | (noun) powder (containing gypsum plaster and glue) that when mixed with water forms a plastic paste used to fill cracks and holes in plaster | Synonyms: spackling compound |
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| subcompact | (noun) a car smaller than a compact car | Synonyms: subcompact car |
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| subspace | (noun) a space that is contained within another space | - |
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| workspace | (noun) space allocated for your work (as in an office) | - |
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