fingerprint (Noun) — A print made by an impression of the ridges in the skin of a finger; often used for biometric identification in criminal investigations.
fingerprint (Noun) — A generic term for any identifying characteristic. ex. "that tax bill had the senator's fingerprints all over it"
fingerprint (Noun) — A smudge made by a (dirty) finger.
fingerprint (Verb) — Take an impression of a person's fingerprints.