OCLC (Online Computer Library Center)

A bibliographic network based on an online database of approximately 28 million cataloging records from its 5500 members, including those of Illinois Library since 1975. It now serves more than 18,000 libraries in 52 countries. The OCLC database is used for cataloging, for reference work, and for interlibrary loan. It is the world's largest and most comprehensive database of bibliographic information. URL: http://www.oclc.org/

Online catalog

The University of Illinois Library's computerized list of materials held.

Online database

Computer databases. Bibliographic databases provide access by author, title, and subject to a group of periodicals, books, or proceedings. Numeric databases provide access to statistical information.

OPAC (Online Public Access Catalog)

A computerized catalog of books and other items in the library.

Operators

Words such as AND, OR, and NOT that are used to combine search terms to broaden or narrow the results of a search.

Overdue

Material which is not returned to the library by its due date is considered overdue.

Oversize

Books that are too large for normal shelves; usually designated with a Q (quarto) or F (folio) before the call number; stored in a special location.

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