noun
a process of officially joining a course, group, or organization
adjective
enrollment can also be used as an adjective to describe something related to the process of joining
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The enrollment process for the new semester will begin next week.
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Hey, have you completed your enrollment for classes yet?
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I heard the enrollment for that course is filling up fast, better hurry!
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Her enrollment in the yoga class marked the beginning of her journey to better health.