A stepmother is a woman who enters one's family by marrying one's parent. Children from her spouse's previous unions are known as her step-children. stepmother definition: 1. the woman who is married to someone's father but who is not their real mother 2. the woman who. Learn more. Stepmother definition is - the wife of one's parent when distinct from one's natural or legal mother. Stepmother — Step moth er, n. [AS. ste[ o]pm[=o]der.] The wife of one s father by a subsequent marriage. [ Webster] . Your stepmother is the woman who has married one of your parents after the death of your mother or divorce of your parents. American English: stepmother /. Stepmother meaning The wife of one's biological father, other than one's biological mother. A woman who is a stepparent. A female stepparent. noun. A woman who is the wife or partner of one's father after the divorce or separation of one's parents or the death of one's mother. 'My mother is dead, and my. From Longman Dictionary of Contemporary EnglishRelated topics: Familystepmotherstep‧moth‧er /ˈstepmʌðə $ -ər/ ○○○ noun [countable] SSFFAMILYa woman who. Stepfathers and stepmothers, despite having affective bonds, do not have parental duties nor rights, and therefore do not have parental authority. Definition of stepmother noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes.