a catalog containing bibliographic records that indicate locations of materials in more than one library or in several units of one library.
Is There Such A Thing As A True Synonym?Thesauruses present a catalog of synonyms from which we may pick and choose words to put into our writing, but a thesaurus used alone is a very bad thing because there is no such thing as a true synonym. Every word has its particular place in the language.
Origin of union catalog
An Americanism dating back to 1905–10
Also called repertory catalog.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019