| ablactation | (noun) the act of substituting other food for the mother's milk in the diet of a child or young mammal | Synonyms: weaning |
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| (noun) the cessation of lactation | - |
| abreaction | (noun) (psychoanalysis) purging of emotional tensions | Synonyms: catharsis, katharsis |
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| abstract | (noun) a concept or idea not associated with any specific instance | Synonyms: abstraction |
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| (noun) a sketchy summary of the main points of an argument or theory | Synonyms: outline, precis, synopsis |
| abstractedness | (noun) preoccupation with something to the exclusion of all else | Synonyms: abstraction |
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| abstracter | (noun) one who makes abstracts or summarizes information | Synonyms: abstractor |
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| abstraction | (noun) a general concept formed by extracting common features from specific examples | Synonyms: abstract entity |
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| (noun) the act of withdrawing or removing something | - |
| (noun) an abstract painting | - |
| (noun) a concept or idea not associated with any specific instance | Synonyms: abstract |
| (noun) preoccupation with something to the exclusion of all else | Synonyms: abstractedness |
| (noun) the process of formulating general concepts by abstracting common properties of instances | Synonyms: generalisation, generalization |
| abstractionism | (noun) an abstract genre of art; artistic content depends on internal form rather than pictorial representation | Synonyms: abstract art |
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| (noun) a representation having no reference to concrete objects or specific examples | Synonyms: unrealism |
| abstractionist | (noun) a painter of abstract pictures | Synonyms: abstract artist |
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| abstractness | (noun) the quality of being considered apart from a specific instance or object | - |
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| abstractor | (noun) one who makes abstracts or summarizes information | Synonyms: abstracter |
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| act | (noun) something that people do or cause to happen | Synonyms: deed, human action, human activity |
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| (noun) a subdivision of a play or opera or ballet | - |
| (noun) a legal document codifying the result of deliberations of a committee or society or legislative body | Synonyms: enactment |
| (noun) a short performance that is part of a longer program | Synonyms: bit, number, routine, turn |
| (noun) a manifestation of insincerity | - |
| actin | (noun) one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form | - |
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| acting | (noun) the performance of a part or role in a drama | Synonyms: performing, playacting, playing |
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| actinia | (noun) any sea anemone or related animal | Synonyms: actinian, actiniarian |
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| actinian | (noun) any sea anemone or related animal | Synonyms: actinia, actiniarian |
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| actiniarian | (noun) any sea anemone or related animal | Synonyms: actinia, actinian |
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| actinide | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinoid, actinon |
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| actinism | (noun) the property of radiation that enables it to produce photochemical effects | - |
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| actinium | (noun) a radioactive element of the actinide series; found in uranium ores | Synonyms: Ac, atomic number 89 |
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| actinoid | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinon |
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| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| actinometer | (noun) an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) | - |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actinomyces | (noun) soil-inhabiting saprophytes and disease-producing plant and animal parasites | - |
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| actinomycete | (noun) any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales | - |
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| actinomycin | (noun) any of various red antibiotics isolated from soil bacteria | - |
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| actinomycosis | (noun) disease of cattle that can be transmitted to humans; results from infection with actinomycetes; characterized by hard swellings that exude pus through long sinuses | - |
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| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| actinon | (noun) any of a series of radioactive elements with atomic numbers 89 through 103 | Synonyms: actinide, actinoid |
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| actinopod | (noun) protozoa having stiff rodlike radiating pseudopods | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
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| action | (noun) the most important or interesting work or activity in a specific area or field | - |
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| (noun) a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong | Synonyms: action at law, legal action |
| (noun) something done (usually as opposed to something said) | - |
| (noun) a military engagement | Synonyms: military action |
| (noun) an act by a government body or supranational organization | - |
| (noun) the operating part that transmits power to a mechanism | Synonyms: action mechanism |
| (noun) In firearms terminology, the mechanism that handles the ammunition (loads, locks, fires, and extracts the cartridges). | - |
| (noun) the trait of being active and energetic and forceful | - |
| (noun) the series of events that form a plot | - |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: activity, natural action, natural process |
| (noun) the state of being active | Synonyms: activeness, activity |
| activating | (noun) the activity of causing to have energy and be active | Synonyms: activation, energizing |
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| activation | (noun) the activity of causing to have energy and be active | Synonyms: activating, energizing |
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| (noun) making active and effective (as a bomb) | - |
| (noun) stimulation of activity in an organism or chemical | - |
| activator | (noun) (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription | - |
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| active | (noun) a person who is a participating member of an organization | - |
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| (noun) the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb | Synonyms: active voice |
| (noun) chemical agent capable of activity | Synonyms: active agent |
| activeness | (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activity |
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| (noun) the state of being active | Synonyms: action, activity |
| activewear | (noun) attire worn for sport or for casual wear | Synonyms: athletic wear, sportswear |
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| activism | (noun) a policy of taking direct action to achieve a political or social goal | - |
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| activist | (noun) a militant reformer | Synonyms: militant |
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| activity | (noun) any specific behavior | - |
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| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |
| actomyosin | (noun) a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions | - |
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| actor | (noun) a theatrical performer | Synonyms: histrion, player, role player, thespian |
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| (noun) a person who acts and gets things done | Synonyms: doer, worker |
| actress | (noun) a female actor | - |
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| actualisation | (noun) making real or giving the appearance of reality | Synonyms: actualization, realisation, realization |
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| actuality | (noun) the state of actually existing objectively | - |
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| actualization | (noun) making real or giving the appearance of reality | Synonyms: actualisation, realisation, realization |
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| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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| actuation | (noun) the act of propelling | Synonyms: propulsion |
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| actuator | (noun) a mechanism that puts something into automatic action | - |
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| adactylia | (noun) congenital absence of fingers and/or toes | Synonyms: adactylism, adactyly |
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| adactylism | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactyly |
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| adactyly | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactylism |
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| agalactia | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactosis |
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| agalactosis | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactia |
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| antibacterial | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| artefact | (noun) a man-made object taken as a whole | Synonyms: artifact |
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| artifact | (noun) a man-made object taken as a whole | Synonyms: artefact |
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| artiodactyl | (noun) placental mammal having hooves with an even number of functional toes on each foot | Synonyms: artiodactyl mammal, even-toed ungulate |
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| ataractic | (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic agent, ataractic drug, tranquilizer, tranquilliser, tranquillizer |
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| attracter | (noun) a characteristic that provides pleasure and attracts | Synonyms: attraction, attractive feature, attractor, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attractor |
| (noun) an entertainer who attracts large audiences | Synonyms: attraction, attractor, draw, drawing card |
| attraction | (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attractiveness |
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| (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attractive feature, attractor, magnet |
| (noun) an entertainment that is offered to the public | - |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attractor, draw, drawing card |
| (noun) the force by which one object attracts another | Synonyms: attractive force |
| attractiveness | (noun) sexual allure | - |
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| (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attraction |
| attractor | (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attraction, attractive feature, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attracter |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attraction, draw, drawing card |
| autodidact | (noun) a person who has taught himself | - |
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| bacteremia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteriaemia, bacteriemia |
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| bacteria | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacterium |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteriemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriaemia |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bacteriostat | (noun) a chemical or biological material that inhibits bacterial growth | - |
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| bacterium | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacteria |
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| bacteroid | (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
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| benefaction | (noun) an act intending or showing kindness and good will | Synonyms: benevolence |
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| (noun) a contribution of money or assistance | - |
| benefactor | (noun) a person who helps people or institutions (especially with financial help) | Synonyms: helper |
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| benefactress | (noun) a woman benefactor | - |
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| brachydactylia | (noun) abnormal shortness of fingers and toes | Synonyms: brachydactyly |
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| brachydactyly | (noun) abnormal shortness of fingers and toes | Synonyms: brachydactylia |
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| bract | (noun) a modified leaf or leaflike part just below and protecting an inflorescence | - |
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| bracteole | (noun) a small bract | Synonyms: bractlet |
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| bractlet | (noun) a small bract | Synonyms: bracteole |
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| cactus | (noun) any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines | - |
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| calefaction | (noun) the property of being warming | Synonyms: incalescence |
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| cataphract | (noun) armor that protects the wearer's whole body | Synonyms: body armor, body armour, coat of mail, suit of armor, suit of armour |
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| cataract | (noun) a large waterfall; violent rush of water over a precipice | - |
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| (noun) an eye disease that involves the clouding or opacification of the natural lens of the eye | - |
| chaenactis | (noun) any of several United States plants having long stalks of funnel-shaped white or yellow flowers | - |
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| character | (noun) (genetics) an attribute (structural or functional) that is determined by a gene or group of genes | - |
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| (noun) the inherent complex of attributes that determines a persons moral and ethical actions and reactions | Synonyms: fiber, fibre |
| (noun) a characteristic property that defines the apparent individual nature of something | Synonyms: lineament, quality |
| (noun) an actor's portrayal of someone in a play | Synonyms: part, persona, role, theatrical role |
| (noun) a written symbol that is used to represent speech | Synonyms: graph, grapheme, graphic symbol |
| (noun) a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability | Synonyms: character reference, reference |
| (noun) a person of a specified kind (usually with many eccentricities) | Synonyms: case, eccentric, type |
| (noun) an imaginary person represented in a work of fiction (play or film or story) | Synonyms: fictional character, fictitious character |
| (noun) good repute | - |
| characterisation | (noun) a graphic or vivid verbal description | Synonyms: characterization, delineation, depiction, picture, word-painting, word picture |
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| (noun) the act of describing distinctive characteristics or essential features | Synonyms: characterization |