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quantitative analysis the chemical analysis of a compound or mixture to determine by exact measurement the amounts and percentages of its constituents.
quantity amount or number. [6 definitions]
quantization in mathematics, the process of converting a continuous set of values into a discrete set.
quantum an irreducible quantity of energy, such as a photon of light. [3 definitions]
quantum bit a fundamental unit of information in quantum computing that is equivalent to the binary bit used in traditional computing; qubit. Whereas the binary bit can only exist in two states (0 or 1), the quantum bit can exist in three states (0, 1, or 0 and 1 simultaneously).
quantum jump a sudden change in the energy level of an atom or molecule. [2 definitions]
quantum mechanics (used with a sing. or pl. verb) a theory in physics describing the motion of objects in terms of the principles of quantum theory.
quantum theory a theory in physics that energy radiates or is absorbed in discontinuous quantities, each a multiple of indivisible units or quanta.
quarantine the enforced separation of people, animals, goods, or the like from others, so as to prevent the spread of contagious illness. [4 definitions]
quark any of several elementary particles believed to be components of protons, neutrons, and related particles.
quarrel an angry or bitter disagreement or argument. [4 definitions]
quarrelsome tending to quarrel easily or frequently; bad-tempered; argumentative.
quarrier one who quarries stone.
quarry1 a large open hole or pit dug for mining stone, marble, gravel, or the like. [3 definitions]
quarry2 an animal hunted for food or sport. [2 definitions]
quarry3 something that is in the shape of a square or diamond, esp. a tile or small windowpane.
quarryman see "quarrier."
quart in the US, a unit of capacity equal to two pints or 0.9464 liter in liquid measure and two pints or 1.101 liters in dry measure. (abbr.: qt.) [3 definitions]
quarter a fraction equal to one fourth of a whole. [15 definitions]
quarterback in football, the chief offensive player who calls the plays and is the first to receive the ball in most plays. [5 definitions]
quarter day any of the four days of the year that are regarded as beginning a new season or quarter and on which quarterly payments are due.