[1] : The Collaborative International Dictionary of English v.0.48

concealment \conceal"ment\, n. of. concelement.
   1. the act of concealing; the state of being concealed.
      1913 webster

            but let concealment, like a worm i' the bud,
            feed on her damask cheek.             --shak.
      1913 webster

            some dear cause
            will in concealment wrap me up awhile. --shak.
      1913 webster

   2. a place of hiding; a secret place; a retreat frem
      observation.
      1913 webster

            the cleft tree
            offers its kind concealment to a few. --thomson.
      1913 webster

   3. a secret; out of the way knowledge. obs.
      1913 webster

            well read in strange concealments.    --shak.
      1913 webster

   4. law suppression of such facts and circumstances as in
      justice ought to be made known. --wharton.
      1913 webster

[2] : WordNet (r) 2.0

concealment
     n 1: the condition of being concealed or hidden syn: privacy,
          privateness, secrecy
     2: a covering that serves to conceal or shelter something;
        "they crouched behind the screen"; "under cover of
        darkness" syn: screen, cover, covert
     3: the activity of keeping something secret syn: concealing,
         hiding
see also:
privacy privateness secrecy screen cover covert 
concealing hiding 

[3] : Moby Thesaurus II by Grady Ward, 1.0

74 moby thesaurus words for "concealment":
   abri, air-raid shelter, airtight secrecy, asylum, bolt-hole,
   bomb shelter, bombproof, bunker, cache, cave, close secrecy,
   closeness, corner, cover, covert, coverture, cranny, crypticness,
   cubby, cubbyhole, cyclone cellar, dark corner, den, disappearance,
   discreetness, discretion, dugout, earth, evasion, evasiveness,
   fallout shelter, foxhole, funk hole, hiddenness, hideaway, hideout,
   hidey hole, hiding, hiding place, hole, hugger-mugger,
   hugger-muggery, immateriality, imperceptibility, indiscernibility,
   invisibility, lair, niche, nonappearance, nook, recess, refuge,
   retreat, safety zone, sanctuary, secrecy, secret place,
   secretiveness, secretness, shelter, stash, storm cave,
   storm cellar, subterfuge, the dark, the invisible, the unseen,
   trench, uncommunicativeness, undercovert, unperceivability,
   unseeableness, unsubstantiality, viewlessness

[4] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

concealment, contracts. the unlawful suppression of any fact or 
circumstance, by one of the parties to a contract, from the other, which in 
justice ought to be made known. 1 bro. ch. r. 420; 1 fonbl. eq. b. 1, c. 3, 
sec. 4, note n; 1 story, eq. jur. sec. 207. 
     2. fraud occurs when one person substantially misrepresents or conceals 
a material fact peculiarly within his own knowledge, in consequence of which 
a delusion exists; or uses a device naturally calculated to lull the 
suspicions of a careful man, and induce him to forego inquiry into a matter 
upon which the other party has information, although such information be not 
exclusively within his reach. 2 bl. com. 451; 3 id. 166; sugd. vend. 1 to 
10; 1 com. contr. 38; 3 b.  c. 623; 5 d.  r. 490; 2 wheat. 183; 11 id. 59; 
1 pet. sup. c. r. 15, 16. the party is not bound, however, to disclose 
patent defects. sugd. vend. 2. 
     3. a distinction has been made between the concealment of latent 
defects in real and personal property. for example, the concealment by an 
agent that a nuisance existed in connexion with a house the owner had to 
hire, did not render the lease void. 6 iv.  m. 358. 1 smith, 400. the rule 
with regard to personalty is different. 3 camp. 508; 3 t. r. 759. 
     4. in insurances, where fairness is so essential to, the contract, a 
concealment which is only the effect of accident, negligence, inadvertence, 
or mistake, if material, is equally fatal to the contract as if it were 
intentional and fraudulent. 1 bl. r. 594; 3 burr. 1909. the insured is 
required to disclose all the circumstances within his own knowledge only, 
which increase the risk. he is not, however, bound to disclose general 
circumstances which apply to all policies of a particular description, 
notwithstanding they may greatly increase the risk. under this rule, it has 
been decided that a policy is void, which was obtained by the concealment 
by the assured of the fact that he had heard that a vessel like his was 
taken. 2 p. wms. 170. and in a case where the assured had information of "a 
violent storm" about eleven hours after his vessel had sailed, and had 
stated only that "there had been blowing weather and severe storms on the 
coast after the vessel had sailed" but without any reference to the 
particular storm it was decided that this was a concealment, which vitiated 
the policy. 2 caines r. 57. vide 1 marsh. ins: 468; park, ins. 276; 14 east, 
r. 494; 1 john. r. 522; 2 cowen, 56; 1 caines, 276; 3 wash. c. c. rep. 138; 
2 gallis. 353; 12 john. 128. 
     5. fraudulent concealment avoids the contract. see, generally, verpl. 
on contr. passim; bouv. inst. index, h.t.; marsh. ins. b. 1, c. 9; 1 bell's 
com. b. 2, pt. 3, c. 15 s. 3, sec. 1; 1 m.  s. 517; 2 marsh. r. 336. 

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