- Dad is defined as a term used for your father.
An example of dad is the name you call the man who is your father.
A young girl with her dad.
dad definition by Webster's New World
Origin: ; from child's cry dada
dad definition by American Heritage Dictionary
Origin: Of baby-talk origin.
dad - Computer Definition
(1) (Database Action Diagram) Documentation that describes the processing performed on data in a database.
(2) (Digital Audio Disc) See CD.