1. pertaining to or constituting evidence - evidentiary technique - an evidentiary fact • Pertains to noun: evidence • Derivationally related forms: evidence • Topics: law, jurisprudence 2. serving as or based on evidence - evidential signs of a forced entry - its evidentiary value • Syn: evidential • Similar to: significant, important • Derivationally related forms: evidence, evidence (for: evidential)