/ dɪˈnɒmɪneɪtə(r); NAmE -ˈnɑːm-/ noun
( mathematics ) the number below the line in a fraction showing how many parts the whole is divided into, for example 4 in ¾
—compare numerator , common denominator
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WORD ORIGIN
mid 16th cent.: from French dénominateur or medieval Latin denominator , from denominare to name, from de- away, formally + nominare to name.