Preamble (noun)

An introductory statement or explanation, especially in a constitution, treaty, or law, that sets out the reasons and intent behind it.

Origin:

From middle french preambule, from late latin praeambulum, from latin prae ("before") + ambulare ("to walk").

Examples:

1. The preamble of the U.S. Constitution sets forth the purpose and goals of the document.
2. The preamble to the treaty between the two countries defined the conditions of the agreement.
3. The preamble of the law stated the reasons why the legislation was necessary.
4. The preamble explains the intentions of the founders of the constitution.
5. The preamble of the bill outlined the objectives of the proposed legislation.