What is the meaning of Accrual?

The act or process of accruing; accumulation.

An increase; something that accumulates, especially an amount of money that periodically accumulates for a specific purpose

from the creditor's viewpoint, a charge incurred in one accounting period that has not been, but is to be, paid by the end of it.

Recruitment (of participants) to a clinical trial.

Source: wiktionary.org