enrolment

from The Century Dictionary.

• noun The act of enrolling; specifically, the registering, recording, or entering of a deed, judgment, recognizance, acknowledgment, etc., in a court of record.
• noun That in which anything is enrolled; a register; a roll.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of enrolling or the state of being enrolled
• noun The people enrolled, considered as a group
• noun The number of people enrolled
• noun The record of such enrolling; registration

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of enrolling