coefficient
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/ˌkəʊɪˈfɪʃnt/
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/ˌkəʊɪˈfɪʃnt/
A number that is multiplied by another number, like in the expression 3 times x, where 3 is the coefficient.
The coefficient of the equation was 4, making it a bit more challenging to solve.
A number that represents a specific characteristic of a material or system, like the friction between two surfaces.
The coefficient of friction between the two materials was quite high, making it difficult to slide them against each other.