in algebra, are such numbers or known quantities as are put before letters or quantities, whether known or unknown, and into which they are supposed to be multiplied. Thus, in $3x$, $a x$, or $b \cdot x$; $3$, $a$, and $b$, are the coefficients of $x$; and in $6a$, $6b$, and $g$, are the coefficients of $a$ and $b$. See Algebra.