---
description: "Definitions of key Reson8 speech-to-text terms: access tokens, interim and final results, flush, phrase boosting, PCM audio, and more."
---

# Glossary

| Term | Description |
|------|-------------|
| **Access token** | A short-lived bearer token obtained via the OAuth2 client credentials flow. Used for client-side applications to avoid exposing the API key directly. |
| **API key** | A secret token used to authenticate requests to the Reson8 API. Scoped to a single client. |
| **Confidence score** | The model's probability for a recognized word, in `(0, 1]`. Available when `include_confidence` is enabled. |
| **Final result** | A stable transcription that will not change as more audio is received. Indicated by `is_final: true`. |
| **Flush** | A request to force the server to finalize any buffered audio and return a transcript immediately. The server responds with a flush confirmation. |
| **Interim result** | A partial transcription that may be revised as more audio is processed. Useful for live feedback during streaming. |
| **Phrase boosting** | A technique to boost recognition of specific terms. |
| **PCM** | Pulse-code modulation — a raw, uncompressed audio encoding. The `pcm_s16le` format (16-bit signed, little-endian) is supported when `encoding` is set explicitly. |
| **Session** | An active WebSocket connection during which audio is streamed and transcriptions are returned. |