Meaning of -EE in English
■ suffix forming nouns:
1》 denoting the person affected by the action of the formative verb: employee.
2》 denoting a person described as or concerned with: absentee.
3》 denoting an object of relatively smaller size: bootee.
from Anglo-Norman Fr. -é , from L. -atus (past participial ending); some forms are anglicized mod. Fr. nouns (e.g. refugee from réfugié ).
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004