step ‧ fa ‧ ther /ˈstepfɑːðə $ -ər/ BrE AmE noun [countable]
a man who is married to your mother but who is not your father
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THESAURUS
▪ father a male parent:
My father’s a doctor.
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He’s a father of three.
▪ dad informal used when talking to your father, or about someone's father:
Can I borrow your car, Dad?
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Her dad retired ten years ago.
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My dad was in the army.
▪ daddy a name for father, which is used especially by young children or when you are talking to young children:
Where’s your daddy?
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Daddy, can I have a drink, please?
▪ pop American English informal ( also pa old-fashioned ) used when talking to your father, or about someone's father:
I helped Pop fix the gate this morning.
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Can I help, Pa?
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He is in New York with his Pop's credit card, eating all the ice cream and pizza the city has to offer.
▪ papa old-fashioned informal used when talking to your father, or about someone's father:
Papa had forbidden me to go.
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She saw her papa 's face change at this news.
▪ sb’s old man informal someone's father – used when talking about him in a way that is not very respectful:
His old man wouldn’t let him use the car.
▪ stepfather ( also stepdad informal ) a man who is married to your mother, who is not your father but often acts as your parent:
Her stepfather is really nice.