From The Collaborative International Dictionary of English v.0.48 [gcide]:
Concealment \Con*ceal"ment\, n. [OF. concelement.]
1. The act of concealing; the state of being concealed.
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But let concealment, like a worm i' the bud,
Feed on her damask cheek. --Shak.
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Some dear cause
Will in concealment wrap me up awhile. --Shak.
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2. A place of hiding; a secret place; a retreat frem
observation.
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The cleft tree
Offers its kind concealment to a few. --Thomson.
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3. A secret; out of the way knowledge. [Obs.]
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Well read in strange concealments. --Shak.
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4. (Law) Suppression of such facts and circumstances as in
justice ought to be made known. --Wharton.
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From WordNet (r) 3.0 (2006) [wn]:
concealment
n 1: the condition of being concealed or hidden [syn: privacy,
privateness, secrecy, concealment]
2: a covering that serves to conceal or shelter something; "a
screen of trees afforded privacy"; "under cover of darkness";
"the brush provided a covert for game"; "the simplest
concealment is to match perfectly the color of the
background" [syn: screen, cover, covert, concealment]
3: the activity of keeping something secret [syn: concealment,
concealing, hiding]