Celtic language

generate a one-sentence description for a given conceptual class.
# Response Format
Return only the sentence: "Description: [one-sentence description of the conceptional class]"

Class: Celtic language

A Celtic language is a member of the Indo-European language family historically spoken in Western Europe, characterized by shared phonological, grammatical, and lexical features found in branches such as Goidelic (e.g., Irish, Scottish Gaelic) and Brittonic (e.g., Welsh, Breton).