Merriam-Webster Collegiate Dictionary - enroll

 also enrol  verb  (~ed; ~ing)  Etymology: Middle English, from Anglo-French enrouler, from en- + rolle roll, register  Date: 14th century  transitive verb  1. to insert, register, or enter in a list, catalog, or roll the school ~s about 800 pupils  2. to prepare a final perfect copy of (a bill passed by a legislature) in written or printed form  3. to roll or wrap up  intransitive verb to ~ oneself or cause oneself to be ~ed we ~ed in the history course  • ~ee noun  • ~ment also enrolment noun