IPA: /ˈstɛpˌdæd/
KK: /ˈstɛpˌdæd/
A man who is married to someone's mother but is not their biological father.
My stepdad is really good at fixing things around the house.
Stepdad → The word is formed from "step" (from Old English *stæpe*, meaning a step or degree) and "dad" (a colloquial term for father, likely derived from baby talk). A stepdad refers to a father figure who is not a biological father but is in a parental role due to marriage or partnership.
Think of 'step' as a degree of relationship and 'dad' as a father figure — a stepdad is a father figure who is a step in the family.