parbi -pab- gismu

x1 (me'o, fraction) is a ratio/rate of x2 (quantity) with respect to x3 (quantity), [x2:x3].

Also x1 fraction/proportion/quotient; x2 dividend/numerator; x3 divisor/denominator. See also frinu, dilcu, mekso.

In notes:

x1 is a quotient of 'x2/x3' [dividend x2 divided by divisor x3], leaving remainder x4.
x1 is a fraction, with numerator x2, denominator x3 (x2/x3).
x1 [quantifier/expression] is a mathematical expression interpreted under rules/convention x2.