-ee : A suffix used, chiefly in law terms, in a passive signification, to indicate the direct or indirect object of an action, or the one to whom an act is done or on whom a right is conferred; as in assignee, donee, alienee, grantee, etc. It is correlative to -or, the agent or doer.

Example:
Can anyone tell me the difference between EE and I bonds?

Taxonomy
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Defination from the web: