nondisclosure agreement - definition and synonyms

noun [countable] business 

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/ˌnɒndɪsˈkləʊʒər əˌɡriːmənt/
singularnondisclosure agreement
pluralnondisclosure agreements
  1. an agreement that employees who have just joined a company, or who are just about to leave a company, often have to sign, not to tell anyone any secret information relating to their employer