a branch of the Indo-European languages that (judging from inscriptions and place names) was spread widely over Europe in the pre-Christian era
"The ancient celtic language once flourished across much of Europe before being largely replaced by Latin and Germanic tongues."
Of or relating to the Celts.
"The celtic traditions of ancient Ireland left a lasting impact on modern folklore."
In plain English: Celtic describes anything related to the ancient people of Europe who spoke Celtic languages and lived in places like Ireland, Scotland, Wales, Brittany, Cornwall, and parts of Britain before being conquered by Romans or other groups.
"The celtic knot on the necklace is an intricate design made of interwoven loops without any beginning or end."
A branch of the Indo-European languages that was spread widely over western and central Europe in the pre-Christian era.
"The ancient Celtic language once flourished across much of western and central Europe before being gradually replaced by Latin and Germanic tongues."
The word entered English in the 17th century via French and Latin as an adjective meaning "of or relating to the Celts." It combines the root for the ancient people with a suffix used to form adjectives describing them.