Engagee is often a misspelling of engager.
Engagee has no English definition.
As a noun engager is
one who, or that which, engages.
engagee
English
Noun
(
en noun)
(historical) A worker in the fur trade in North America; a voyageur. engager
English
Noun
(
en noun)
One who, or that which, engages.
- engagers in conflicts
One who enters into an engagement or agreement; a surety.
- Several sufficient citizens were engagers . — Wood.
----