Definition: The word "gclid" refers to a term in search engine optimization (SEO) for long-tail keywords, as it appears in Google's analytics reports. Detailed definitions include: - "GCL": The keyword used in Google's search console. - "GC": A special suffix that helps identify the specific context and relevance of this word. In essence, Gclid is a term related to Google's search console that describes how long-tail keywords are found on the web.