serment
noun
Plural: serments
Oath; a formal solemn promise.
Examples:
—All right, dear Hubert. Let us come to the point. To be clear, and truth to be told, tonight's undertaking has in fact nothing to do with the serment in Azure Minaret. In the present matter, you are not bound by the oath you took. (Source: J∙ Okram - The Mystery of the Rammed Key.)
Translations:
Czech / Čeština (CZ): přísaha
Slovak / Slovenčina (SK): prísaha