A person who signs someone up or registers them for a program, school, or organization.
From Old French 'enroller' (to record in a roll), formed from 'en-' (cause to be) + 'role' (roll of paper). The meaning shifted from literally rolling up documents to the modern sense of registering people.
The term 'roll' originally referred to rolled parchment where names were recorded—so when you 'enroll' someone, you're metaphorically adding their name to a scroll, just like medieval clerks literally did!
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