From Black's Law Dictionary, Fifth Edition

Conceal. To hide, secrete, or withhold from the knowledge of others. To withdraw from observation; to
withhold from utterance or declaration; to cover or keep from sight. To hide or withdraw from observation, cover or keep from sight, or prevent discovery of. People v. Eddington, 201 Cai.App.2d 574, 20 Cal.Rptr. 122, 124.

Concealment. To conceal. A withholding of something which one knows and which one, in duty, is bound to reveal. A "concealment" in law of insurance implies an intention to withhold or secrete information so hat the one entitled to be informed will remain in ignorance. Indiana Ins. Co. v. Knoll, 142 Ind.App.
506, 236 N.E.2d 63, 70. See also Conceal; Fraudulent concealment

"Fraudulent concealment. The hiding or suppression of a material fact or circumstance which the party is legally or morally bound to disclose. The employment of artifice planned to prevent inquiry or escape investigation and to mislead or hinder the acquisition of information disclosing a right of action; acts relied on must be of an affirmative character and fraudulent. Fundunburks v. Michigan Mut. Liability Co., 63 Mich.App. 405, 234 N.W.2d 545, 547. The test of whether failure to disclose material facts constitutes fraud is the existence of a duty, legal or equitable, arising from the relation of the parties; failure to disclose a material fact with intent to mislead or defraud under such circumstances being equivalent to an actual "fraudulent concealment." Fraudulent concealment justifying a rescission of a contract is the intentional concealment of some fact known to the party charged, which is material for the party injured to know to prevent being defrauded; the concealment of a fact which one is bound to disclose being the equivalent of an indirect representation that such fact does not exist. See Material fact."

"Fraudulent intent. Such intent exists where one, either a view of benefitting himself or misleading another
into a course of action, makes a representationwhich he knows to be false or which he does not believe to be true. In re Orenduff, D.C.Okl., 226 F.Supp. 312, 314. fraudulent or dishonest act. One which involves bad faith, a breach of honesty, a want of integrity, or moral turpitude. Hartford Ace. & lndem. Co. v. Singer, 185 Va. 620, 39 S.E.2d 505, 507, 508."
(From Black's Law Dictionary, Fifth Edition. See "conceal3p" in reference.)