n. A going wrong; failure of a purposed result; untoward event; mischance: as. the criminal escaped by miscarriage of justice.n. A wrong or perverse course, as of conduct; improper action or behavior; misdemeanor.n. In pathology, the act of miscarrying (see miscarry, v. i., 3); properly, untimely delivery before the twenty-eighth week of gestation. See abortion, 1.