| difference | (noun) the quality of being unlike or dissimilar | - |
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| (noun) a disagreement or argument about something important | Synonyms: conflict, difference of opinion, dispute |
| (noun) a variation that deviates from the standard or norm | Synonyms: departure, deviation, divergence |
| (noun) the number that remains after subtraction; the number that when added to the subtrahend gives the minuend | Synonyms: remainder |
| (noun) a significant change | - |
| differentia | (noun) distinguishing characteristics (especially in different species of a genus) | - |
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| differential | (noun) a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves | Synonyms: differential gear |
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| (noun) a quality that differentiates between similar things | - |
| (noun) the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx | Synonyms: derivative, derived function, differential coefficient, first derivative |
| differentiation | (noun) the mathematical process of obtaining the derivative of a function | - |
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| (noun) a discrimination between things as different and distinct on the basis of their characteristics or attributes | Synonyms: distinction |
| (noun) (biology) the structural adaptation of some body part for a particular function | Synonyms: specialisation, specialization |
| differentiator | (noun) a person who (or that which) differentiates | Synonyms: discriminator |
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| difficultness | (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficulty |
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| difficulty | (noun) an effort that is inconvenient | Synonyms: trouble |
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| (noun) the quality of being almost beyond one's ability to deal with and requiring a great effort to achieve a positive result | Synonyms: difficultness |
| diffidence | (noun) lack of self-confidence | Synonyms: self-distrust, self-doubt |
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| difflugia | (noun) a protozoan with an ovoid shell of cemented sand grains | - |
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| diffraction | (noun) when light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands | - |
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| diffuseness | (noun) the spatial property of being spread out over a wide area or through a large volume | - |
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| diffuser | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffusor |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffusor |
| diffusion | (noun) the act of dispersing or diffusing something | Synonyms: dispersal, dispersion, dissemination |
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| (noun) the property of being diffused or dispersed | Synonyms: dissemination |
| (noun) the spread of social institutions (and myths and skills) from one society to another | - |
| (noun) (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration | - |
| diffusor | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffuser |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffuser |
| diflunisal | (noun) nonsteroidal anti-inflammatory (trade name Dolobid) used to treat arthritis and other inflammatory conditions | Synonyms: Dolobid |
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