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[rey-shee-om-i-ter] /ˌreɪ ʃiˈɒm ɪ tər/

(in three-color photography) a device for determining the exposure factors of the filters to be used.


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  • Ration

    [rash-uh n, rey-shuh n] /ˈræʃ ən, ˈreɪ ʃən/ noun 1. a fixed allowance of provisions or food, especially for soldiers or sailors or for civilians during a shortage: a daily ration of meat and bread. 2. an allotted amount: They finally saved up enough gas rations for the trip. 3. rations. verb (used with object) […]

  • Rationale

    [rash-uh-nal] /ˌræʃ əˈnæl/ noun 1. the fundamental reason or reasons serving to account for something. 2. a statement of reasons. 3. a reasoned exposition of principles. /ˌræʃəˈnɑːl/ noun 1. a reasoned exposition, esp one defining the fundamental reasons for a course of action, belief, etc n. 1650s, “exposition of principles,” from Late Latin rationale, noun […]

  • Rational-emotive therapy

    [rash-uh-nl-i-moh-tiv] /ˈræʃ ə nl ɪˈmoʊ tɪv/ noun, Psychology. 1. a form of therapy in which a patient is asked to reject irrational attitudes and assumptions in order to deal effectively with stressful situations.

  • Rational-form

    noun, Mathematics. 1. a quotient of two polynomials with integral coefficients.

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