dad
n. countable A1 Beginner Oxford US //ˈdæd// UK //dˈæd// dad
n. an informal and friendly word for your father. You use it when talking to him or about him with family.
n. an informal term for one's father, used as both a common noun and a proper noun in direct address. It carries a familiar and affectionate register.
My dad is coming to visit me this weekend.
After the game ended, he called his dad to tell him about the winning goal.
While the term is primarily used within the family unit, many adults continue to refer to their fathers as 'Dad' throughout their lives to maintain a sense of emotional closeness.
Usage
When used as a name to address someone directly, it is typically capitalized; when used with a possessive like 'my', it is not.