SECAI Core · phase 5 of 15 · noun

Retrieval-augmented generation

A technique where a generative model retrieves relevant information from an external knowledge source and then uses that to generate its answer

The Explain card

Plain English
Retrieval-augmented generation (RAG) has a model fetch relevant information from an external knowledge source first, then use that material to generate its answer, instead of relying only on training memory.
Example
A company assistant answers "What is our laptop encryption policy?" by searching the internal policy repository, pulling the matching document, and composing a reply from it. The answer reflects current policy, not whatever the model absorbed during training.
Why it matters
RAG reduces hallucination and keeps answers current, but every retrieved document becomes model input. A poisoned page in the knowledge base can carry instructions or falsehoods straight into the answer.
Hook
RAG is open-book exam mode for the model, so guard the book.

Word knowledge

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

The company chatbot runs retrieval-augmented generation against the policy vector index, then cites the returned encryption-policy chunk in its reply.

Why these words
  • retrieval Old French retrouver, to find again names the hunt, so the producing hangs on a search rather than on memory
  • augmented Latin augere, to increase, as a past participle marks that producing as boosted, so the hunt is extra apparatus rather than the whole job
  • generation Latin generatio, a begetting, from generare, to beget supplies the head noun, the producing that the other two words qualify
Where it came from
Origin
English coinage by Patrick Lewis and colleagues, from Old French retrouver (to find again), Latin augere (to increase) as a past participle, and Latin generatio (a begetting)
Entered the language
2020
What changed
Retrieval had meant finding again, then a library hunt, then a computer search. Augmented had meant increased, then boosted by extra apparatus, as in augmented reality. Generation had meant a begetting, then a cohort, then the producing of text. Lewis and colleagues hyphenated the first two onto generation in a 2020 paper title, and the three-word label passed from that title into everyday lab and product speech.
How it is spelled
Pattern
hyphen joins a noun to a past participle used as an adjective: retrieval-augmented
Pattern
retrieve drops its silent e before -al
Pattern
au spells /ɔː/ in augment, as it does in author and autumn
Pattern
-ation turns generate into a noun of activity
Breaks the pattern
retrieval-augmented keeps its hyphen as a unit; generation stays a free word
Breaks the pattern
the catalog spelling is three words; speech and papers often collapse it to RAG

Spelled like

  • data-augmented
  • survival
  • author
  • information
Broken into chunks
  • retriev
    • retrieve
    • retriever
  • al
    • survival
    • arrival
    • withdrawal
  • aug
    • augment
    • August
    • augmentation
  • ment
    • fragment
    • document
    • monument
  • gen
    • generate
    • genesis
    • progenitor
  • ation
    • information
    • creation
    • operation
What it sits beside

Same subject

Same shape

  • retrieval-augmented language model
  • knowledge-augmented generation
  • data-augmented training

Grounding family

Hyphenated -augmented compounds

  • data-augmented
  • knowledge-augmented
  • context-augmented

Generation family

Where it sits in the deck

Phase 5: Interacting with Models: Prompting, APIs, and Retrieval

With a working model and clean data, learn the interaction layer — how users and systems communicate instructions and retrieve grounded answers.

Neighbours in this phase