A2A stands for application-to-application. It is workplace tech jargon meaning two software systems are talking to each other directly without a human in the middle. If your kid uses this they probably work in IT, engineering, or AI. Not slang, not concerning. You may also see it as agent-to-agent in newer AI contexts, which means two AI assistants exchanging messages. Outside of work or school computing contexts it is rarely used.
A2A
Agent-to-Agent.
ˌeɪ.tuːˈeɪDocumented since 2010s2010sGen Ztrending390 viewsLast reviewed Jun 29, 2026＋ Add a definition
Etymology timeline
Born ~2010 · no dated citations yetSeen in the wild
Firecrawl: A2A - Wikipedia
3. [1](https://en.wikipedia.org/wiki/A2A#cite_ref-:0_3-0) [2](https://en.wikipedia.org/wiki/A2A#cite_ref-:0_3-1)["Dun and Bradstreet Corporate Directory for A2A"](https://www.dnb.com/business-directory/company-profile…
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Firecrawl: The Agent2Agent Protocol (A2A) - Hacker News
We'd be happy to look.<br>A2A is a conduit for agents to speak in their native modalities.
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Definitions
Global
+534100%
#1·Apr 24, 2026Global
Agent-to-Agent. Protocols for AI agents to communicate with each other autonomously — emerging as the multi-agent era becomes real in 2025. "A2A lets our planner agent hand off work to the research agent without human glue." Adjacent to MCP; specifically about peer-to-peer not client-server.
"A2A lets our planner agent hand off work to the research agent without human glue."
Origin: Tech / AI / developer industry term.
For parents
A2A stands for application-to-application. It is workplace tech jargon meaning two software systems are talking to each other directly without a human in the middle. If your kid uses this they probably work in IT, engineering, or AI. Not slang, not concerning. You may also see it as agent-to-agent in newer AI contexts, which means two AI assistants exchanging messages. Outside of work or school computing contexts it is rarely used.
For ESL learners
A2A is a technical abbreviation used in software engineering and AI. It means application-to-application or, more recently, agent-to-agent. Use it only in technical writing, integration documents, or developer chats. The formal equivalent is "system-to-system integration" or "inter-application communication." A common mistake is treating it as general slang; native technical speakers would never use A2A in marketing copy or casual conversation. Always spell it out the first time you use it in a document.
Heard in the wild
“3. [1](https://en.wikipedia.org/wiki/A2A#cite_ref-:0_3-0) [2](https://en.wikipedia.org/wiki/A2A#cite_ref-:0_3-1)["Dun and Bradstreet Corporate Directory for A2A"](https://www.dnb.com/business-directory/company-profiles.a2a_spa.5d78150a4756e4f259fcf297746634e8.html).”
“We'd be happy to look.<br>A2A is a conduit for agents to speak in their native modalities.”
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Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
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