Accrual
From ACT Wiki
1. Accounting. An amount owing - but not yet invoiced - for services or goods received during the accounting period. An accrual is a form of liability, because it represents cash that will have to be paid out in the future, for a benefit that has already been received.
2. Pensions.
In a defined benefit pension scheme, the build up over time of entitlement to future benefits, resulting from additional years of pensionable service.