Definition one: The recognition of a set of repeatable attack patterns across the intrusion kill chain.

Definition two: Determining the responsibility for offensive cyber operations.

CyberWire Glossary link: https://thecyberwire.com/glossary/attribution

Audio reference link: Nunnikhoven, M., 2018. Cybersecurity Basics #9 - Attack Attribution [Video]. YouTube. URL www.youtube.com/watch?v=rlyMz5jN_Vs