Hid·den p. p. & a. from Hide. Concealed; put out of view; secret; not known; mysterious.
 Hidden fifths or Hidden octaves Mus., consecutive fifths or octaves, not sounded, but suggested or implied in the parallel motion of two parts towards a fifth or an octave.
 Syn: -- Hidden, Secret, Covert.
 Usage: Hidden may denote either known to on one; as, a hidden disease; or intentionally concealed; as, a hidden purpose of revenge. Secret denotes that the thing is known only to the party or parties concerned; as, a secret conspiracy. Covert literally denotes what is not open or avowed; as, a covert plan; but is often applied to what we mean shall be understood, without openly expressing it; as, a covert allusion. Secret is opposed to known, and hidden to revealed.
    Bring to light the hidden things of darkness.   --1 Cor. iv. 5.
 My heart, which by a secret harmony
 Still moves with thine, joined in connection sweet.   --Milton.
 By what best way,
 Whether of open war, or covert guile,
 We now debate.   --Milton.

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