Abbreviation for 'cross-reference', indicating a connection or link to related information in another part of a document or database. Commonly used in technical documentation and academic writing.
Shortened form of 'cross-reference', which emerged in English in the early 20th century from the combination of 'cross' (meaning across or intersecting) and 'reference' (from Latin 'referre', meaning to carry back or relate to).
Before hyperlinks existed, xrefs were the primary way to create interconnected information networks in printed materials. Library card catalogs were essentially massive xref systems, allowing researchers to navigate between related topics through careful cross-indexing.
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