li·brar·i·an (l?-brâr??-?n)n.1. A person who is a specialist in library work.2. A person who is responsible for a collection of specialized or technical information or materials, such as musical scores or computer documentation.li·brar?i·an·ship? n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.librarian (la??br??r??n) n (Library Science & Bibliography) a person in charge of or assisting in a libraryCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014li?brar?i?an (la??br??r i ?n) n. 1. a person engaged in library work who has professional training in library science. 2. any person in charge of a library. 3. a person in charge of any specialized body of information, as a collection of musical scores. [1660?70] li?brar?i?an?ship`, n. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.