From deposit +‎ -ee.

depositee (plural depositees)

1. The person with whom something is deposited.
2. (historical) A member of the lowest of the three population classes created by Pol Pot and the Khmer Rouge party in Cambodia after their revolution in the 1970s. These people were 'deposited' in the villages after being removed from the cities.

• John A. Simpson and Edmund S. C. Weiner, editors (1989), “depositee”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, →ISBN.
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