IPA: /nɒn.dɪsˈkloʊ.ʒər/
KK: /nɑnˈdɪsˌkloʊʒər/
A policy or agreement that prevents someone from sharing certain information with others.
The company required all employees to sign a nondisclosure before starting their jobs.
Nondisclosure → It is formed from "non-" (meaning not) and "disclosure" (from Latin "dis-" meaning apart and "claudere" meaning to close). The word refers to the act of not revealing or keeping something closed from disclosure.
Think of 'not' ('non-') revealing something that is 'closed' ('claudere') — that's why nondisclosure means not revealing information.