evidence (n.) Look up evidence at Dictionary.com
c.1300, "appearance from which inferences may be drawn," from Old French evidence, from Late Latin evidentia "proof," originally in rhetoric, "distinction, vivid presentation, clearness," from stem of Latin evidens "obvious, apparent" (see evident).

Meaning "ground for belief" is from late 14c.; that of "obviousness" is from 1660s. Legal senses are from c.1500, when it began to oust witness. As a verb, from c.1600. Related: Evidenced; evidencing.