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Definition of FINGERPRINT
: the impression of a fingertip on any surface; also: an ink impression of the lines upon the fingertip taken for the purpose of identification
: something that identifies: as
a: a trait, trace, or characteristic revealing origin or responsibility
b: analytical evidence (as a spectrogram) that characterizes an object or substance; especially: the chromatogram or electrophoretogram obtained by cleaving a protein by enzymatic action and subjecting the resulting collection of peptides to two-dimensional chromatography or electrophoresis
c: the base-pair pattern in an individual's DNA obtained by DNA fingerprinting