noun
A legal contract to protect confidential information. Often abbreviated as NDA in business contexts.
See also: 秘密保持契約
プロジェクト開始前に機密保持契約を結びました。
We signed a non-disclosure agreement before starting the project.
Synonym; both refer to confidentiality agreements, but 機密保持契約 may emphasize industrial or corporate secrets more strongly.
Compound of 機密 (confidential), 保持 (maintenance), and 契約 (contract). A straightforward modern legal term.