librarian

[lahy-brair-ee-uhn]
noun
1.
a person trained in library science and engaged in library service.
2.
a person in charge of a library, especially the chief administrative officer of a library.
3.
a person who is in charge of any specialized body of literature, as a collection of musical scores.

Origin:
1660–70; libr(ary) + -arian

sublibrarian, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
librarian (laɪˈbrɛərɪən)
 
n
a person in charge of or assisting in a library

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

librarian
1713; see library. Earlier form was library-keeper (1640s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Ask the librarian how to get these books for you if they are not in your
  library.
Visit the library and ask a librarian, not a student worker.
As a librarian, anytime people can engage information it is a benefit for
  science.
It was so bad that the school librarian even called in my parents to express
  concern over my reading habits.
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