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.
558 terms
10 topics
1847–2026 timeline
Built as a living reference
Clear words. Useful context.
01
Plain English firstThe definition comes before the jargon.
02
Usage over hypeEstablished meanings are separated from new or informal ones.
03
Show the trailSources appear on entries as they are reviewed.
Latest update · October 2026
New in the AI Dictionary
Fresh language for the newest shifts in AI, explained without the jargon.
agent-in-the-middle
an attack on a multi-agent AI system in which a malicious relay intercepts and changes messages exchanged between agents without directly compromising the agents themselves
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AI agent stack
the set of technical layers used to build and operate an AI agent, typically including models, orchestration, tools, memory, runtime infrastructure, evaluation, observability, and guardrails
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digital worker
a software-based worker, increasingly implemented as an AI agent, that is assigned a business role and carries out part or all of a work process with some degree of independence
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excessive agency
an AI security vulnerability in which a model or agent has more functions, permissions, or autonomy than its intended task requires, allowing an error or manipulated instruction to cause damaging actions
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