Online Public Access Catalog

<library> (OPAC) A computerised system to catalogue and organise materials in a library (the kind that contains books).

OPACs have replaced card-based catalogues in many libraries.

An OPAC is available to library users (public access).

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On-Line Analytical Processing Online Computer Library Center, Inc. On-Line Computer system Online Media On-line Process Synthesizer	OPAC	On-Line Transaction Processing Ontic onto ontology OnX