A person or official who enlists other people into military service; a recruiting officer.
From 'enlist' plus the agent suffix '-er,' which creates a noun for 'one who does' the action. This word has been used since the 17th century to describe military recruiters.
An enlister has the opposite role from an enlistee—while the enlistee joins up, the enlister is the one convincing and processing recruits, which is a perfect example of how English's '-er' and '-ee' suffixes create mirror roles in any transaction or process.
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