Meaning of -EE in English

-EE

■ 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.

Origin

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.