# Glossary

| Term | Definition |
|------|-----------|
| **Block** | A discrete unit of knowledge stored as structured markdown |
| **BM25F** | Best Matching 25 with field weights — the primary scoring algorithm |
| **Co-retrieval graph** | Graph linking blocks frequently returned together |
| **Fact card** | Atomic 10-20 word sub-block indexed from Statements |
| **Graph boost** | Score propagation from co-retrieval graph neighbors |
| **Hard negative** | Block scoring high on BM25 but low on reranking |
| **Knee cutoff** | Adaptive truncation at steepest score drop |
| **MCP** | Model Context Protocol — standard for AI tool integration |
| **MIND kernel** | Configuration file for customizing scoring behavior |
| **Proposal** | A staged memory change awaiting human approval |
| **Recall** | The primary search operation in MIND-Mem |
| **Reranking** | Second-pass scoring of BM25 candidates |
| **RRF** | Reciprocal Rank Fusion — method for combining multiple rankings |
| **Workspace** | Root directory containing all memory files |
