For purposes of this subpart, the following definitions apply:
Example 1 to paragraph (f): A supervisory employee of the Agency for International Development has just been reassigned from Washington, DC, to a foreign duty location. As a farewell party, 12 subordinates have decided to take the supervisory employee out to lunch at a restaurant. It is understood that the employees will pay for their own meals and that the cost of the supervisor's lunch will be divided equally among the 12. Even though the amount they will contribute is not determined until the supervisor orders lunch, the contribution made by those who choose to participate in the farewell lunch is voluntary.
5 C.F.R. §2635.303