Pro rata is a Latin term that is used in law and economics.[1][2]
It is used to divide something by calculation or by a ratio.
Etymology
Pro rata has a Latin etymology. It is from pro (according to, for, or by) and rata. Rata means "calculated" (rate or change).[3]
Example
For example, the cost of a pizza can be divided pro rata depending on the number of slices each person ate.
References