# monosemanticity

CEFR C2 · Noun

Source: https://englishreference.com/word/monosemanticity
Updated: 2026-09-28

## Definition

the ideal property where an individual feature or neuron corresponds to only one clear, understandable concept.

For teachers: the property of a neural representation where each latent feature direction corresponds unambiguously to a single isolated and human-interpretable concept.

## Examples

- Scientists strive for monosemanticity so each feature in the model can be explained with a single label.
- Sparse dictionary learning successfully extracted millions of features exhibiting high monosemanticity from the frontier model.
- Achieving true monosemanticity across all hidden layers is considered the holy grail of mechanistic interpretability and AI model auditing.

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