Relating to or resembling the Celts, an ancient Indo-European people who spread across Europe, or their languages and cultures.
From Latin Celtae, the Roman name for Celtic peoples, combined with the suffix -ian. The term entered English in the 18th century as scholars studying ancient European history needed a way to describe these specific populations and their characteristics.
The Celts were so widespread across Europe around 500 BCE that they influenced languages from Ireland to Turkey, yet 'Celsian' rarely appears in modern English—most people just say 'Celtic' instead, showing how language preferences change over time.
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