according to the Cambridge dictionary, accrual means ''adding together of interest or different investments over a period of time'' but it doesn't match in this context! would you explain it?
Working Time Regulations (WTRs): For the first year of work, special accrual rules apply. For each month of employment, workers are entitled to one twelfth of the annual holiday. After the first year or employment, you can take your holiday entitlement at any time,with your employer's approval.