/diːklæsɪfaɪˈkāSH(ə)n/ – verb
Definition: hủy bỏ tính mật của tài liệu, rút ra khỏi khu vực bảo mật.
A more thorough explanation: Declassification refers to the process of removing the classification status of information or documents, typically by a government or other authority, thereby making them available for public access or dissemination.
Example: The declassification of the government documents allowed the public to access previously confidential information.