Which term means "according to calculation; in proportion"?

The term that means "according to calculation; in proportion" is "pro rata." This Latin phrase is often used in legal and financial contexts to describe a proportional allocation or distribution. For example, when expenses or revenues need to be divided among multiple parties based on their respective shares, the term "pro rata" indicates that each party will receive an amount that corresponds closely to their input or stake.

Understanding "pro rata" is critical in fields like accounting and finance, where precise calculations are essential for fairness and clarity. This concept applies to various scenarios, such as dividend distributions, allocation of costs, or determining the amount owed when a party withdraws from an agreement.

The other terms provided have different meanings and applications, which do not align with the concept of proportional calculations. "Post hac" refers to something that occurs after something else, "post mortem" pertains to matters that are considered after a death or event, and "prima facie" means "at first glance" or "on its face," indicating that something appears to be true until proven otherwise. These distinctions highlight the specific application of "pro rata" in discussions of proportionality.