# bearer token

CEFR C1 · Compound

Source: https://englishreference.com/word/bearer-token
Updated: 2026-07-22

## Definition

a digital key that gives access to a computer system or website. Anyone who has this key can use it, so you must keep it very safe.

For teachers: a security credential that grants access to a protected resource to any party in possession of it. It functions on the principle that the holder (the bearer) is authorized, requiring no further cryptographic proof or identification.

## Examples

- The app uses a bearer token to log you in automatically.
- When you log into the API, the server sends back a bearer token that your browser must include in every future request.
- Security protocols for bearer tokens must be rigorous, as the lack of a secondary authentication factor means that any intercepted token can be used by an attacker to impersonate the legitimate user.

## Usage notes

- Often used in the context of OAuth 2.0 and web development; frequently paired with the 'Authorization' header.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.