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English word clandestine comes from Latin *clam-de, and later Latin clandestinus (Clandestine, secret, concealed.)
*clam-de (Latin)
clandestinus (Latin)
Clandestine, secret, concealed.
clandestin (French)
Clandestine.
clandestine (English)
(freemasonry, of a person or lodge) Not recognized as a regular member.. Done or kept in secret, sometimes to conceal an illicit or improper purpose.