(often used as a name) father That's my dad over there. Do you live with your mum or your dad? Is it OK if I borrow the car, Dad? See related entries: Relations Word Origin mid 16th cent.: perhaps imitative of a young child's first syllables da, da.Extra examples My old dad got really wild if you said he was working-class. She went on holiday with her mum and dad. That’s my dad over there.