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Kept or done in secret, often to conceal an illicit or improper purpose. See Synonyms at secret.

[Latin clandestīnus, probably blend of *clam-de, secretly (from clam; see kel- in Indo-European roots) and intestīnus, internal; see intestine.]

clan·des′tine·ly adv.
clan·des′tine·ness, clan′des·tin′i·ty n.
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The habit, practice, or policy of keeping secrets:
References in periodicals archive ?
Both these behaviors associated with courting and romance acquire a tinge of clandestineness from her situation, and for that reason we may deduce that even friendly critics such as Emma and Mr.
Of course, clandestineness did not always work; in England, secret Catholic worship did not escape official persecution.
The Council, however, though recognizing previously contracted clandestine marriages had ruled that clandestineness would be an impediment to validity thenceforth (Canons and Decrees of the Council of Trent, 24th session, chap.