1. 
   Libellus
   A libellus (plural libelli) was a document given to a Roman citizen to certify performance of a pagan sacrifice, hence demonstrating loyalty to the authorities of the Roman Empire. They could also mean certificates of indulgence, in which the confessors or martyrs interceded for apostate Christians...
   Found op http://en.wikipedia.org/wiki/Libellus
   
   
2. 
   libellus
   Latin, meaning: little book.
   Found op http://archives.nd.edu/lll.htm
   
   
3. 
   libellus
   1) Latin
   Found op little book
   
   

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