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monopoly complete control over a service or commodity within a given market, so that competition is eliminated. [5 definitions]
monopsony the market condition that exists when there is only one buyer, who can thus exert great influence on price. (Cf. duopsony, monopoly, oligopsony.)
monorail a railroad whose cars run along a single rail, or the rail itself.
monosaccharide a simple sugar, such as glucose or fructose, that does not hydrolyze.
monosodium glutamate a white crystalline powder that intensifies the flavor of foods, esp. meat, often used in Chinese cuisine.
monostich a poem having one metrical line, such as an epigram. [2 definitions]
monosyllabic having only one syllable. [2 definitions]
monosyllable a word of only one syllable.
monotheism the belief that there is only one supreme being.
monotint monochrome.
monotone speech or singing with little or no variation in pitch. [5 definitions]
monotonous uninteresting due to lack of variation; tedious. [2 definitions]
monotony tiresome lack of variation.
monotreme any of the lowest order of mammals, such as the platypus and spiny anteater, that lay eggs and have a common opening for the digestive, urinary, and genital tracts.
monotype in biology, a single species that is the unique representative of its gender, family, or higher taxonomic classification.
monotypic of a biological species, being the unique representative of one's gender, family, or higher taxonomic classification.
monovalent in chemistry, able to combine with only one other atom or chemical group; univalent. [2 definitions]
monoxide a chemical resulting from the addition of one atom of oxygen per molecule.
Monroe Doctrine the U.S. doctrine proscribing European intervention in the affairs of Mexico and Central and South America, and prohibiting further colonization on the American continents.
Monrovia the seaport capital of Liberia.
Monseigneur (sometimes l.c.) a French title of honor and respect given to princes, bishops, and other men of high birth or rank. [2 definitions]