# preamble

/pɹiˈæmbəɫ/ (US) · /pɹˈiːæmbəl/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/preamble
Updated: 2026-05-20

## Definition

the first part of a document or piece of software that explains the purpose or gives instructions. It is like the introduction that tells you what to expect.

For teachers: the introductory section of a formal document, such as a constitution or a software license, that provides background or explains the purpose of the text. In computing, it often refers to the initial data or instructions that a program reads before executing the main code.

## Examples

- The preamble of the license explains why the software is free.
- Before the main script runs, it checks the preamble to ensure the system requirements are met.
- The preamble to the treaty establishes the foundational principles of international cooperation, while the subsequent articles provide the specific legal obligations for each signatory nation.

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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.