What is the definition of a rant?

As defined in the Cambridge Dictionary, Rant is – to speak, write or shout in a loud, uncontrolled, or angry way, often saying confused or silly things.

Example #1: I get fed up with my mother ranting and raving (about my clothes) all the time.

Example #2: The minister’s speech descended into a rant against his political opponents.

Example #3: I got really wound up and started ranting and raving.