registration in WordNet English dictionary

1. the act of adjusting something to match a standard
   adjustment  registration  readjustment 
   
2. the act of enrolling
   registration  enrollment  enrolment 
   
3. the body of people (such as students) who register or enroll at the same time
   registration  enrollment 
   
4. (music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops
   registration 
   
5. a document certifying an act of registering
   registration