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Plain-language reference

AI Glossary

Understand the model, retrieval, evaluation, agent, and infrastructure terms that appear in real AI projects.

23 definitions

Agent

Agents

A model-driven system that can choose actions, call tools, and iterate toward a goal.

Agentic workflow

Agents

A constrained sequence where one or more agents plan, act, verify, and hand work between steps.

Chunking

Retrieval

Splitting source material into smaller passages so it can be embedded, retrieved, or placed into context.

Context window

Models

The maximum number of input and generated tokens a model can handle in one request.

Embedding

Retrieval

A numeric representation of content used to measure semantic similarity.

Evaluation set

Evaluation

A representative collection of inputs and expected behavior used to measure an AI system.

Grounding

Retrieval

Connecting a model response to supplied evidence, tools, or authoritative source material.

Guardrail

Evaluation

A validation or policy layer that checks model inputs, outputs, or actions before they proceed.

Hallucination

Evaluation

A fluent model response that contains unsupported or invented claims.

Inference

Infrastructure

Running a trained model to generate a prediction, classification, or response.

KV cache

Infrastructure

Stored attention keys and values that avoid recomputing earlier tokens during generation.

Latency

Infrastructure

The elapsed time between sending a request and receiving useful output.

LLM-as-judge

Evaluation

Using a language model to score or compare outputs against a rubric.

Modality

Models

A kind of input or output such as text, image, audio, video, or files.

Prompt injection

Agents

Instructions in untrusted content that attempt to override the intended behavior of an AI system.

Quantization

Infrastructure

Representing model weights with lower precision to reduce memory and often improve inference speed.

RAG

Retrieval

Retrieval-augmented generation: finding relevant sources and placing them into the model context before generation.

Reranker

Retrieval

A model that reorders retrieved results to put the most relevant evidence first.

Structured output

Models

A response constrained to a known schema, such as a validated JSON object.

Temperature

Models

A sampling control that changes how concentrated or varied token selection is during generation.

Token

Models

A unit of text processed by a model, often a word fragment, symbol, or punctuation mark.

Tool calling

Agents

A model producing a structured request for an external function, API, or application action.

Vector database

Retrieval

A store optimized for indexing embeddings and finding semantically similar items.