Continuously updated · AI Dictionary
The language of AI,
clearly defined.
A field guide to the words changing how we build, work and think—from token and transformer to AI agents and vibe coding.
388 terms
10 topics
1847–2026 timeline
Latest update · October 2026
New in the AI Dictionary
Fresh language for the newest shifts in AI, explained without the jargon.
x402
an open payment protocol that uses the HTTP 402 Payment Required status code to let software clients, especially AI agents, automatically pay for APIs, data, content, or computing services as part of a web request
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agent sprawl
the uncontrolled proliferation of AI agents across an organization faster than the organization can inventory, govern, secure, maintain, or retire them
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AI observability
the practice of collecting and connecting traces, metrics, logs, evaluations, and other telemetry so that developers can understand how an AI application behaves in production and why it produced a particular result
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agentic advertising
an advertising model in which AI agents plan, negotiate, buy, sell, optimize, or measure media on behalf of advertisers and publishers under machine-readable budgets, policies, and approval rules
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