AI Lexicon for Financial Services

76 essential AI terms every compliance, risk, engineering, and product team  needs to know — defined by the U.S. Treasury, explained for practitioners.

The U.S. Department of the Treasury’s Artificial Intelligence Executive Oversight Group (AIEOG) published its official AI Lexicon in February 2026 — a standardized vocabulary of 76 terms drawn from NIST, ISO, SEC, FinCEN, FSOC, OCC, the EU AI Act, and leading academic research.

At Equinox Compliance, we’ve taken each term and translated it into practical, plain-language guidance for compliance officers, risk managers, and technology leaders at banks, fintechs, and financial services firms. Every entry includes the official government definition, what it means in practice, why it matters for your institution, and what your compliance team should do about it.

Whether you’re building an AI governance framework, preparing for a regulatory exam, or evaluating AI vendors, this lexicon is your reference.