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qualifier a person or thing that qualifies, esp. to participate in a competition. [2 definitions]
qualify to make eligible or competent, as for a job; certify as competent. [8 definitions]
qualitative of or concerning the nature or attributes of something, as opposed to its amount. (Cf. quantitative.)
qualitative analysis the chemical analysis of a compound or mixture to determine the elements and other ingredients of which it is composed.
quality a distinguishing feature or inherent characteristic; property or trait. [5 definitions]
quality circle any small group of workers in a factory or the like that meets regularly to discuss production improvements.
quality control a system by which to maintain a desired standard of quality in a product or process.
qualm a feeling of guilt, doubt, or misgiving. [2 definitions]
quandary a situation of uncertainty, puzzlement, or hesitation; dilemma.
quanta pl. of quantum.
quantifiable capable of being measured or counted, or of being conceived in terms of amount.
quantify to find or express the quantity of.
quantitative of, concerning, or capable of being measured or expressed as, a quantity. [2 definitions]
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]
quantum an irreducible quantity of energy, such as a photon of light. [3 definitions]
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.