Define: "Lump Sum":
This is the primary method of the settlement of a life insurance policy. The policy proceeds are paid to the beneficiary(s) all at once rather than in installment payments.
More Examples of Lump Sum:
An employee will receive a lump-sum payment for any unused annual leave when he or she separates from Federal service or enters on active duty in the armed forces and elects to receive a lump-sum payment. Generally, a lump-sum payment will equal the pay the employee would have received had he or she remained employed until expiration of the period covered by the annual leave.
Calculating a Lump-Sum Payment
An agency calculates a lump-sum payment by multiplying the number of hours of accumulated and accrued annual leave by the employee's applicable hourly rate of pay, plus other types of pay the employee would have received while on annual leave, excluding any allowances that are paid for the sole purpose of retaining a Federal employee in Government service (e.g., retention allowances and physicians comparability allowances).
Further details - Lump Sum: OPM.GOV