evidence-based

The compound adjective "evidence-based" is a modern construction that logically combines two established English words to create a precise term. The first element, "evidence," originates from the Latin evidentia, meaning "clearness" or "proof," which itself derives from evidens ("clear, obvious"). The second element, "based," stems from the Latin basis, meaning "foundation" or "pedestal." The term emerged prominently in the late 20th century, particularly in the fields of medicine and policy, to describe practices and decisions firmly grounded in empirical data and systematic research rather than tradition or anecdote. Thus, the word's literal meaning, "founded on proof," directly and transparently conveys its modern abstract sense of being rigorously supported by objective findings.

Structure: evidence (proof) + based (founded on) - evidence: From Latin evidentia (clearness, proof), from evidens (clear, obvious). Functions as a noun root meaning "proof or information indicating whether a belief is true." - based: From Old French baser (to lower, build a foundation), from Latin basis (foundation, base). Functions as a participial adjective suffix meaning "having as a foundation or primary constituent."