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x

noun [U] (AMOUNT NOT STATED)
 
 
/eks/

Definition

used to represent a number, or the name of person or thing that is not known or stated: If 2x = 8, then x = 4. Witness x stated that she had seen Cooper on repeated occasions.Mathematical symbols
(Definition of x noun (AMOUNT NOT STATED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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