English
engager
From engage + -er.
A compound of engage + -er
Proto-Indo-European *wedʰ- ‘to pledge’
…
Frankish *wadi ‘pledge’
Old French gage ‘pledge’
Old French engagier ‘to pledge, engage’
Middle English engagen
English engage
Today it means
noun One who, or that which, engages.
Language periods are conventional ranges, not dates for this word.
Etymograph / engager