Fingerprint/ˈfɪŋɡərprɪnt/ Definition 1 of 3Pro Tip 1/3Crime Scene Clue Fingerprints are often used in detective stories to solve crimes. The detective lifted the clear fingerprint from the glass. Pro Tip 2/3Personal Identifier Every person's fingerprint is unique, like a personal signature. Her fingerprint was the key to unlock her phone. Pro Tip 3/3Figurative Use 'Leaving a fingerprint' can mean having an impact or influence. His mentorship left a lasting fingerprint on my career.